{"id":12699,"date":"2021-08-26T08:15:00","date_gmt":"2021-08-26T01:15:00","guid":{"rendered":"https:\/\/kiencang.net\/?p=12699"},"modified":"2022-09-01T11:32:31","modified_gmt":"2022-09-01T04:32:31","slug":"cach-tinh-pagarank","status":"publish","type":"post","link":"https:\/\/kiencang.net\/cach-tinh-pagarank\/","title":{"rendered":"C\u00e1ch t\u00ednh PageRank &#8211; m\u00f3n \u0111\u1ed3 c\u1ed5 gi\u00e1 tr\u1ecb trong SEO"},"content":{"rendered":"\n<p>PageRank l\u00e0 ch\u1ee7 \u0111\u1ec1 \u0111\u01b0\u1ee3c th\u1ea3o lu\u1eadn r\u1ea5t nhi\u1ec1u trong c\u1ed9ng \u0111\u1ed3ng nh\u1eefng ng\u01b0\u1eddi l\u00e0m SEO chuy\u00ean nghi\u1ec7p (SEO experts). C\u1ed1t l\u00f5i c\u1ee7a PageRank l\u00e0 m\u1ed9t c\u00f4ng th\u1ee9c to\u00e1n h\u1ecdc (mathematical formula), m\u00e0 khi nh\u00ecn v\u00e0o, n\u00f3 d\u01b0\u1eddng nh\u01b0 l\u00e0m m\u1ecdi ng\u01b0\u1eddi s\u1ee3 h\u00e3i, nh\u01b0ng th\u1ef1c ra PageRank l\u1ea1i kh\u00e1 d\u1ec5 hi\u1ec3u.<\/p>\n\n\n\n<p>D\u00f9 v\u1eady, nhi\u1ec1u ng\u01b0\u1eddi d\u01b0\u1eddng nh\u01b0 \u0111\u00e3 hi\u1ec3u sai! M\u1ed9t v\u00ed d\u1ee5 c\u1ee5 th\u1ec3 l\u00e0 &#8220;Chris Ridings c\u1ee7a trang www.searchenginesystems.net&#8221; \u0111\u00e3 vi\u1ebft m\u1ed9t b\u00e0i b\u00e1o c\u00f3 ti\u00eau \u0111\u1ec1 &#8220;Gi\u1ea3i th\u00edch PageRank: M\u1ecdi th\u1ee9 b\u1ea1n c\u1ea7n bi\u1ebft v\u1ec1 PageRank&#8221;. Nhi\u1ec1u ng\u01b0\u1eddi \u0111\u00e3 ch\u1ec9 ra r\u1eb1ng, b\u00e0i b\u00e1o ch\u1ee9a m\u1ed9t sai l\u1ea7m c\u01a1 b\u1ea3n ngay trong ph\u1ea7n gi\u1ea3i th\u00edch! Kh\u00f4ng may, \u0111i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 m\u1ed9t s\u1ed1 l\u1eddi khuy\u00ean trong b\u00e0i vi\u1ebft \u0111\u00f3 kh\u00f4ng ho\u00e0n to\u00e0n ch\u00ednh x\u00e1c.<\/p>\n\n\n\n<p>B\u1eb1ng c\u00e1ch tr\u00ecnh b\u00e0y m\u00e3 ch\u1ea1y ch\u00ednh x\u00e1c \u0111\u1ec3 t\u00ednh to\u00e1n PageRank th\u1ef1c(*), t\u00f4i hy v\u1ecdng \u0111\u1ea1t \u0111\u01b0\u1ee3c m\u1ed9t s\u1ed1 m\u1ee5c ti\u00eau trong b\u00e0i vi\u1ebft n\u00e0y:<\/p>\n\n\n\n<ol><li>Gi\u1ea3i th\u00edch r\u00f5 r\u00e0ng c\u00e1ch t\u00ednh PageRank<\/li><li>L\u1ea5y c\u00e1c v\u00ed d\u1ee5 trong b\u00e0i vi\u1ebft c\u1ee7a Chris v\u00e0 b\u1ed5 sung th\u00eam th\u00f4ng tin c\u1ee7a t\u00f4i, \u0111\u01b0a ra gi\u00e1 tr\u1ecb PageRank ch\u00ednh x\u00e1c cho m\u1ed7i bi\u1ec3u \u0111\u1ed3. B\u1eb1ng c\u00e1ch tr\u00ecnh b\u00e0y m\u00e3 s\u1eed d\u1ee5ng \u0111\u1ec3 t\u00ednh to\u00e1n m\u1ed7i bi\u1ec3u \u0111\u1ed3, t\u00f4i tho\u1ea3i m\u00e1i \u0111\u00f3n nh\u1eadn c\u00e1c \u0111\u00e1nh gi\u00e1 c\u1ee7a m\u1ecdi ng\u01b0\u1eddi &#8211; ch\u1ee7 y\u1ebfu l\u00e0 trong n\u1ed7 l\u1ef1c nh\u1eb1m \u0111\u1ea3m b\u1ea3o c\u00e1c v\u00ed d\u1ee5 l\u00e0 ch\u00ednh x\u00e1c, ngo\u00e0i ra c\u0169ng l\u00e0 v\u00ec \u0111o\u1ea1n m\u00e3 c\u00f3 th\u1ec3 gi\u00fap gi\u1ea3i th\u00edch c\u00e1ch t\u00ednh PageRank<\/li><li>M\u00f4 t\u1ea3 m\u1ed9t s\u1ed1 nguy\u00ean t\u1eafc v\u00e0 quan s\u00e1t v\u1ec1 thi\u1ebft k\u1ebf website d\u1ef1a tr\u00ean c\u00e1c v\u00ed d\u1ee5 \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n ch\u00ednh x\u00e1c.<\/li><\/ol>\n\n\n\n<p>(*):<em> T\u00e1c gi\u1ea3 l\u1eadp tr\u00ecnh \u0111o\u1ea1n m\u00e3 ch\u1ea1y k\u1ebft qu\u1ea3 PageRank cho t\u1eebng v\u00f2ng l\u1eb7p. R\u1ea5t ti\u1ebfc l\u00e0 c\u00e1c \u0111o\u1ea1n m\u00e3 gi\u1edd \u0111\u00e3 kh\u00f4ng c\u00f2n \u0111\u1ec3 ch\u00fang ta ki\u1ec3m tra. N\u1ed9i dung g\u1ed1c ti\u1ebfng Anh c\u1ee7a b\u00e0i n\u00e0y \u0111\u01b0\u1ee3c vi\u1ebft v\u00e0o n\u0103m 2012 (c\u00f3 th\u1ec3 c\u00f2n tr\u01b0\u1edbc \u0111\u00f3 n\u1eefa). B\u00e0i vi\u1ebft c\u1ee7a Chris Ridings \u0111\u01b0\u1ee3c vi\u1ebft v\u00e0o n\u0103m 2002 &#8211; ch\u00fa th\u00edch c\u1ee7a ng\u01b0\u1eddi d\u1ecbch.<\/em><\/p>\n\n\n\n<p>B\u1ea5t k\u1ef3 nh\u00e0 thi\u1ebft k\u1ebf website gi\u1ecfi n\u00e0o c\u0169ng c\u1ea7n b\u1ecf th\u1eddi gian \u0111\u1ec3 hi\u1ec3u r\u00f5 c\u00e1ch PageRank ho\u1ea1t \u0111\u1ed9ng th\u1ef1c s\u1ef1 nh\u01b0 th\u1ebf n\u00e0o &#8211; n\u1ebfu b\u1ea1n kh\u00f4ng \u0111\u1ec3 \u00fd, b\u1ed1 c\u1ee5c trang web (site&#8217;s layout) c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 l\u00e0m t\u1ed5n th\u01b0\u01a1ng v\u1ecb tr\u00ed c\u1ee7a trang tr\u00ean Google!<\/p>\n\n\n\n<p>[L\u01b0u \u00fd: T\u00f4i kh\u00f4ng c\u00f3 b\u1ea5t k\u1ef3 m\u00e2u thu\u1eabn c\u00e1 nh\u00e2n n\u00e0o v\u1edbi Chris. N\u1ebfu t\u00f4i t\u00ecm \u0111\u01b0\u1ee3c b\u1ea5t k\u1ef3 b\u00e0i b\u00e1o n\u00e0o kh\u00e1c v\u1ec1 ch\u1ee7 \u0111\u1ec1 n\u00e0y, t\u00f4i c\u0169ng s\u1ebd nh\u1eadn x\u00e9t nh\u01b0 v\u1eady th\u00f4i.]<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_60 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >M\u1ee5c l\u1ee5c<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\" role=\"button\"><label for=\"item-6577d735dfd45\" ><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input aria-label=\"Toggle\" aria-label=\"item-6577d735dfd45\"  type=\"checkbox\" id=\"item-6577d735dfd45\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/kiencang.net\/cach-tinh-pagarank\/#1_PageRank_duoc_su_dung_nhu_the_nao\" title=\"#1. PageRank \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u01b0 th\u1ebf n\u00e0o?\">#1. PageRank \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u01b0 th\u1ebf n\u00e0o?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/kiencang.net\/cach-tinh-pagarank\/#2_Cac_dinh_nghia\" title=\"#2. C\u00e1c \u0111\u1ecbnh ngh\u0129a\">#2. C\u00e1c \u0111\u1ecbnh ngh\u0129a<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/kiencang.net\/cach-tinh-pagarank\/#3_Vay_PageRank_la_gi\" title=\"#3. V\u1eady PageRank l\u00e0 g\u00ec?\">#3. V\u1eady PageRank l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/kiencang.net\/cach-tinh-pagarank\/#4_PageRank_duoc_tinh_toan_nhu_the_nao\" title=\"#4. PageRank \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n nh\u01b0 th\u1ebf n\u00e0o?\">#4. PageRank \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n nh\u01b0 th\u1ebf n\u00e0o?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/kiencang.net\/cach-tinh-pagarank\/#5_Nhan_duoc_cau_tra_loi_nhanh\" title=\"#5. Nh\u1eadn \u0111\u01b0\u1ee3c c\u00e2u tr\u1ea3 l\u1eddi nhanh\">#5. Nh\u1eadn \u0111\u01b0\u1ee3c c\u00e2u tr\u1ea3 l\u1eddi nhanh<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/kiencang.net\/cach-tinh-pagarank\/#6_Cac_vi_du\" title=\"#6. C\u00e1c v\u00ed d\u1ee5\">#6. C\u00e1c v\u00ed d\u1ee5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/kiencang.net\/cach-tinh-pagarank\/#7_Thao_luan_ve_gia_tri_trung_binh\" title=\"#7. Th\u1ea3o lu\u1eadn v\u1ec1 gi\u00e1 tr\u1ecb trung b\u00ecnh\">#7. Th\u1ea3o lu\u1eadn v\u1ec1 gi\u00e1 tr\u1ecb trung b\u00ecnh<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/kiencang.net\/cach-tinh-pagarank\/#8_Loi_cuoi\" title=\"#8. L\u1eddi cu\u1ed1i\">#8. L\u1eddi cu\u1ed1i<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_PageRank_duoc_su_dung_nhu_the_nao\"><\/span>#1. PageRank \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u01b0 th\u1ebf n\u00e0o?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><a href=\"https:\/\/kiencang.net\/pagerank-la-gi\/\" target=\"_blank\" rel=\"noreferrer noopener\">PageRank l\u00e0 m\u1ed9t trong c\u00e1c ph\u01b0\u01a1ng ph\u00e1p Google s\u1eed d\u1ee5ng<\/a> \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh m\u1ee9c \u0111\u1ed9 li\u00ean quan ho\u1eb7c t\u1ea7m quan tr\u1ecdng c\u1ee7a m\u1ed9t trang (page&#8217;s relevance or importance). N\u00f3 ch\u1ec9 l\u00e0 m\u1ed9t ph\u1ea7n c\u1ee7a c\u00e2u chuy\u1ec7n khi \u0111\u1ec1 c\u1eadp \u0111\u1ebfn danh s\u00e1ch k\u1ebft qu\u1ea3 tr\u1ea3 v\u1ec1 c\u1ee7a Google (Google listing), nh\u01b0ng c\u00e1c kh\u00eda c\u1ea1nh kh\u00e1c \u0111\u00e3 \u0111\u01b0\u1ee3c th\u1ea3o lu\u1eadn \u1edf b\u00e0i kh\u00e1c (v\u00e0 lu\u00f4n thay \u0111\u1ed5i) v\u00e0 PageRank \u0111\u1ee7 th\u00fa v\u1ecb \u0111\u1ec3 c\u00f3 m\u1ed9t b\u00e0i vi\u1ebft d\u00e0nh ri\u00eang cho n\u00f3.<\/p>\n\n\n\n<p>PageRank c\u0169ng \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb (**) tr\u00ean thanh c\u00f4ng c\u1ee5 c\u1ee7a tr\u00ecnh duy\u1ec7t n\u1ebfu b\u1ea1n c\u00e0i Google toolbar (<a href=\"https:\/\/toolbar.google.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/toolbar.google.com\/<\/a>). Nh\u01b0ng thanh c\u00f4ng c\u1ee5 c\u1ee7a PageRank ch\u1ec9 hi\u1ec3n th\u1ecb gi\u00e1 tr\u1ecb t\u1eeb 0 \u0111\u1ebfn 10 v\u00e0 n\u00f3 d\u01b0\u1eddng nh\u01b0 l\u00e0 thang \u0111o \u0111\u01b0\u1ee3c t\u00ednh d\u01b0\u1edbi d\u1ea1ng logarithmic:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Thanh c\u00f4ng c\u1ee5 PageRank (d\u1ef1a tr\u00ean log 10)<\/strong><\/td><td><strong>Gi\u00e1 tr\u1ecb PageRank th\u1ef1c<\/strong><\/td><\/tr><tr><td>0<\/td><td>0 &#8211; 10<\/td><\/tr><tr><td>1<\/td><td>10 &#8211; 1000<\/td><\/tr><tr><td>2<\/td><td>1000 &#8211; 10 000<\/td><\/tr><tr><td>3<\/td><td>10 000 &#8211; 100 000<\/td><\/tr><tr><td>4<\/td><td>v\u00e0 c\u1ee9 ti\u1ebfp t\u1ee5c theo s\u1ed1 m\u0169 nh\u01b0 v\u1eady<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>(**): <em>V\u00e0o n\u0103m 2016, Google \u0111\u00e3 lo\u1ea1i b\u1ecf ho\u00e0n to\u00e0n thanh c\u00f4ng c\u1ee5 n\u00e0y, m\u1ed9t trong c\u00e1c l\u00fd do (d\u00f9 kh\u00f4ng \u0111\u01b0\u1ee3c tuy\u00ean b\u1ed1 ch\u00ednh th\u1ee9c) l\u00e0 th\u00f4ng s\u1ed1 n\u00e0y d\u1ec5 b\u1ecb l\u1ea1m d\u1ee5ng v\u00e0o vi\u1ec7c mua b\u00e1n li\u00ean k\u1ebft v\u00e0 do \u0111\u00f3 k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm c\u00f3 kh\u1ea3 n\u0103ng b\u1ecb thao t\u00fang &#8211; ch\u00fa th\u00edch c\u1ee7a ng\u01b0\u1eddi d\u1ecbch<\/em><\/p>\n\n\n\n<p>Ch\u00fang ta kh\u00f4ng th\u1ec3 bi\u1ebft chi ti\u1ebft ch\u00ednh x\u00e1c c\u1ee7a thang \u0111o n\u00e0y, b\u1edfi v\u00ec nh\u01b0 ch\u00fang ta s\u1ebd th\u1ea5y sau n\u00e0y r\u1eb1ng gi\u00e1 tr\u1ecb l\u1edbn nh\u1ea5t PR c\u1ee7a t\u1ea5t c\u1ea3 c\u00e1c trang tr\u00ean web thay \u0111\u1ed5i m\u1ed7i th\u00e1ng khi Google c\u1eadp nh\u1eadt l\u1ea1i ch\u1ec9 m\u1ee5c (re-indexing) c\u1ee7a h\u1ecd! N\u1ebfu ch\u00fang ta gi\u1ea3 \u0111\u1ecbnh thang \u0111o l\u00e0 logarithmic (m\u1eb7c d\u00f9 ch\u1ec9 c\u00f3 m\u1ed9t s\u1ed1 b\u1eb1ng ch\u1ee9ng kh\u00f4ng r\u00f5 r\u00e0ng cho \u0111i\u1ec1u n\u00e0y t\u1ea1i th\u1eddi \u0111i\u1ec3m b\u00e0i g\u1ed1c ti\u1ebfng Anh n\u00e0y \u0111\u01b0\u1ee3c vi\u1ebft), sau \u0111\u00f3 Google c\u00f3 th\u1ec3 \u0111\u01a1n gi\u1ea3n l\u00e0 g\u00e1n trang th\u1ef1c c\u00f3 PR cao nh\u1ea5t l\u00e0 10 tr\u00ean thanh c\u00f4ng c\u1ee5 v\u00e0 ch\u1ea5m \u0111i\u1ec3m ph\u1ea7n c\u00f2n l\u1ea1i m\u1ed9t c\u00e1ch th\u00edch h\u1ee3p.<\/p>\n\n\n\n<p>Th\u1eadm ch\u1ec9 \u0111\u00f4i khi thanh c\u00f4ng c\u1ee5 c\u0169ng \u0111o\u00e1n gi\u00e1 tr\u1ecb m\u00e0 th\u00f4i! Thanh c\u00f4ng c\u1ee5 th\u01b0\u1eddng hi\u1ec3n th\u1ecb PR cho c\u00e1c trang t\u00f4i m\u1edbi ch\u1ec9 v\u1eeba t\u1ea3i l\u00ean, v\u00e0 c\u00e1c trang \u0111\u00f3 kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c l\u1eadp ch\u1ec9 m\u1ee5c ngay l\u00fac \u0111\u1ea5y \u0111\u01b0\u1ee3c!<\/p>\n\n\n\n<p>\u0110i\u1ec1u d\u01b0\u1eddng nh\u01b0 \u0111ang x\u1ea3y ra l\u00e0 thanh c\u00f4ng c\u1ee5 nh\u00ecn v\u00e0o URL c\u1ee7a trang m\u00e0 tr\u00ecnh duy\u1ec7t hi\u1ec3n th\u1ecb v\u00e0 lo\u1ea1i b\u1ecf t\u1ea5t c\u1ea3 m\u1ecdi th\u1ee9 n\u1eb1m sau d\u1ea5u &#8220;\/&#8221; (c\u00f3 ngh\u0129a l\u00e0 n\u00f3 ch\u1ec9 \u0111\u1ebfn trang &#8220;cha&#8221; trong thu\u1eadt ng\u1eef v\u1ec1 URL). N\u1ebfu Google c\u00f3 PR cho trang cha, th\u00ec n\u00f3 s\u1ebd tr\u1eeb \u0111i 1 v\u00e0 hi\u1ec3n th\u1ecb l\u00ean thanh c\u00f4ng c\u1ee5 cho gi\u00e1 tr\u1ecb c\u1ee7a trang \u0111\u00f3. N\u1ebfu n\u00f3 kh\u00f4ng c\u00f3 PR cho trang cha, n\u00f3 s\u1ebd \u0111i \u0111\u1ebfn &#8220;trang cha c\u1ee7a trang cha&#8221;, nh\u01b0ng s\u1ebd tr\u1eeb \u0111i 2, v\u00e0 c\u1ee9 ti\u1ebfp t\u1ee5c nh\u01b0 v\u1eady cho \u0111\u1ebfn khi \u0111\u1ebfn t\u00ean mi\u1ec1n g\u1ed1c m\u1edbi th\u00f4i. N\u1ebfu n\u00f3 kh\u00f4ng th\u1ec3 t\u00ecm th\u1ea5y PR theo c\u00e1ch n\u00e0y, ngh\u0129a l\u00e0 n\u00f3 kh\u00f4ng th\u1ec3 t\u00ecm th\u1ea5y trang \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n PR th\u1ef1c s\u1ef1 th\u00ec thanh c\u00f4ng c\u1ee5 s\u1ebd hi\u1ec3n th\u1ecb m\u00e0u x\u00e1m nh\u1ea1t.<\/p>\n\n\n\n<p>L\u01b0u \u00fd r\u1eb1ng n\u1ebfu thanh c\u00f4ng c\u1ee5 d\u1ef1 \u0111o\u00e1n theo c\u00e1ch n\u00e0y, PR Th\u1ef1c S\u1ef1 c\u1ee7a trang l\u00e0 0 &#8211; m\u1eb7c d\u00f9 PR c\u1ee7a trang s\u1ebd \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n ngay sau khi b\u1ecd c\u1ee7a Google t\u00ecm th\u1ea5y trang l\u1ea7n \u0111\u1ea7u ti\u00ean.<\/p>\n\n\n\n<p>PageRank kh\u00f4ng n\u00f3i g\u00ec v\u1ec1 n\u1ed9i dung ho\u1eb7c k\u00edch c\u1ee1 c\u1ee7a m\u1ed9t trang, c\u0169ng nh\u01b0 ng\u00f4n ng\u1eef v\u0103n b\u1ea3n, ho\u1eb7c <a href=\"https:\/\/kiencang.net\/van-ban-neo\/\" target=\"_blank\" rel=\"noreferrer noopener\">v\u0103n b\u1ea3n neo<\/a> \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong li\u00ean k\u1ebft!<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Cac_dinh_nghia\"><\/span>#2. C\u00e1c \u0111\u1ecbnh ngh\u0129a<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>T\u00f4i s\u1ebd s\u1eed d\u1ee5ng m\u1ed9t s\u1ed1 thu\u1eadt ng\u1eef k\u1ef9 thu\u1eadt v\u00e0 t\u1eeb vi\u1ebft t\u1eaft trong b\u00e0i vi\u1ebft n\u00e0y. Gi\u1edd l\u00e0 l\u00fac th\u00edch h\u1ee3p \u0111\u1ec3 \u0111\u1ecbnh ngh\u0129a t\u1ea5t c\u1ea3 c\u00e1c thu\u1eadt ng\u1eef:<\/p>\n\n\n\n<ul><li><strong>PR<\/strong>: Vi\u1ebft t\u1eaft c\u1ee7a PageRank: gi\u00e1 tr\u1ecb trang th\u1ef1c t\u1ebf \u0111\u01b0\u1ee3c t\u00ednh b\u1edbi Google. Nh\u01b0 ch\u00fang ta s\u1ebd th\u1ea5y v\u1ec1 sau, n\u00f3 c\u00f3 th\u1ec3 c\u00f3 gi\u00e1 tr\u1ecb t\u1eeb 0,15 cho \u0111\u1ebfn c\u1ea3 h\u00e0ng tri\u1ec7u.<\/li><li><strong>Thanh c\u00f4ng c\u1ee5 PR<\/strong>: Gi\u00e1 tr\u1ecb PageRank hi\u1ec3n th\u1ecb trong thanh c\u00f4ng c\u1ee5 Google tr\u00ean tr\u00ecnh duy\u1ec7t c\u1ee7a b\u1ea1n. N\u00f3 c\u00f3 gi\u00e1 tr\u1ecb n\u1eb1m trong kho\u1ea3ng t\u1eeb 0 \u0111\u1ebfn 10.<\/li><li><strong>Backlink<\/strong>: N\u1ebfu trang A li\u00ean k\u1ebft \u0111\u1ebfn trang B, th\u00ec trang B \u0111\u01b0\u1ee3c n\u00f3i r\u1eb1ng c\u00f3 m\u1ed9t &#8220;backlink&#8221;(***) t\u1eeb trang A.<\/li><\/ul>\n\n\n\n<p>Nh\u01b0 v\u1eady l\u00e0 \u0111\u1ee7 r\u1ed3i, h\u00e3y quay l\u1ea1i ch\u1ee7 \u0111\u1ec1 ch\u00ednh&#8230;<\/p>\n\n\n\n<p>(***): <em>Trong gi\u1edbi SEO, backlink th\u01b0\u1eddng \u0111\u01b0\u1ee3c hi\u1ec3u l\u00e0 li\u00ean k\u1ebft c\u00f3 \u0111\u01b0\u1ee3c t\u1eeb h\u1ec7 th\u1ed1ng website b\u00ean ngo\u00e0i, ch\u1ee9 kh\u00f4ng bao g\u1ed3m li\u00ean k\u1ebft n\u1ed9i b\u1ed9 trong c\u00f9ng website \u0111\u00f3. B\u00e0i vi\u1ebft n\u00e0y th\u00ec kh\u00f4ng ph\u00e2n bi\u1ec7t nh\u01b0 v\u1eady. Li\u00ean k\u1ebft c\u00f3 \u0111\u01b0\u1ee3c t\u1eeb li\u00ean k\u1ebft n\u1ed9i b\u1ed9 (internal link) hay website ngo\u00e0i tr\u1ecf \u0111\u1ebfn \u0111\u1ec1u \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 backlink &#8211; ch\u00fa th\u00edch c\u1ee7a ng\u01b0\u1eddi d\u1ecbch.<\/em><\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Vay_PageRank_la_gi\"><\/span>#3. V\u1eady PageRank l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>N\u00f3i m\u1ed9t c\u00e1ch ng\u1eafn g\u1ecdn PageRank l\u00e0 m\u1ed9t &#8220;phi\u1ebfu b\u1ea7u \/ vote&#8221;, v\u00e0 ng\u01b0\u1eddi \u0111i b\u1ea7u l\u00e0 t\u1ea5t c\u00e1c trang kh\u00e1c tr\u00ean Web, gi\u00fap ch\u00fang ta bi\u1ebft t\u1ea7m quan tr\u1ecdng c\u1ee7a m\u1ed9t trang. M\u1ed9t li\u00ean k\u1ebft \u0111\u01b0\u1ee3c xem nh\u01b0 m\u1ed9t phi\u1ebfu b\u1ea7u \u1ee7ng h\u1ed9 (kh\u00f4ng ph\u00e2n bi\u1ec7t \u0111\u00f3 l\u00e0 li\u00ean k\u1ebft n\u1ed9i b\u1ed9, hay li\u00ean k\u1ebft ngo\u00e0i). N\u1ebfu kh\u00f4ng c\u00f3 li\u00ean k\u1ebft c\u00f3 ngh\u0129a l\u00e0 kh\u00f4ng c\u00f3 s\u1ef1 \u1ee7ng h\u1ed9 (nh\u01b0ng \u0111i\u1ec1u n\u00e0y gi\u1ed1ng v\u1edbi vi\u1ec7c kh\u00f4ng \u0111i b\u1ecf phi\u1ebfu ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00e0 b\u1ecf phi\u1ebfu ch\u1ed1ng l\u1ea1i trang).<\/p>\n\n\n\n<p>Tr\u00edch t\u1eeb t\u00e0i li\u1ec7u g\u1ed1c c\u1ee7a Google, PageRank \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a nh\u01b0 sau:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p>Ch\u00fang ta gi\u1ea3 \u0111\u1ecbnh trang A c\u00f3 c\u00e1c trang T1&#8230;Tn tr\u1ecf \u0111\u1ebfn n\u00f3 (v\u00ed d\u1ee5, l\u00e0 c\u00e1c tr\u00edch d\u1eabn). Tham s\u1ed1 d l\u00e0 h\u1ec7 s\u1ed1 gi\u1ea3m tr\u1eeb c\u00e1i c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp trong kho\u1ea3ng t\u1eeb 0 \u0111\u1ebfn 1. Ch\u00fang ta th\u01b0\u1eddng thi\u1ebft l\u1eadp d v\u1edbi gi\u00e1 tr\u1ecb 0,85. C\u00f3 th\u00eam th\u00f4ng tin chi ti\u1ebft v\u1ec1 d \u1edf ph\u1ea7n k\u1ebf. C(A) \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a nh\u01b0 l\u00e0 s\u1ed1 li\u00ean k\u1ebft tr\u1ecf ra ngo\u00e0i c\u1ee7a trang A. PageRank c\u1ee7a trang A c\u00f3 c\u00f4ng th\u1ee9c nh\u01b0 sau:<\/p><p><i>PR(A) = (1-d) + d (PR(T1)\/C(T1) + &#8230; + PR(Tn)\/C(Tn))<\/i><\/p><p>L\u01b0u \u00fd l\u00e0 PageRank h\u00ecnh th\u00e0nh m\u1ed9t d\u1ea1ng ph\u00e2n ph\u1ed1i x\u00e1c su\u1ea5t tr\u00ean to\u00e0n b\u1ed9 trang web, do \u0111\u00f3 t\u1ed5ng PageRank c\u1ee7a t\u1ea5t c\u1ea3 c\u00e1c trang web s\u1ebd l\u00e0 m\u1ed9t.<\/p><p>PageRank ho\u1eb7c PR(A) c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng m\u1ed9t thu\u1eadt to\u00e1n l\u1eb7p \u0111\u01a1n gi\u1ea3n, v\u00e0 t\u01b0\u01a1ng \u1ee9ng v\u1edbi h\u00e0m ri\u00eang c\u1ee7a ma tr\u1eadn li\u00ean k\u1ebft chu\u1ea9n h\u00f3a c\u1ee7a web.<\/p><\/blockquote>\n\n\n\n<p>Ph\u1ea7n m\u00f4 t\u1ea3 \u1edf tr\u00ean kh\u00f4ng qu\u00e1 h\u1eefu d\u1ee5ng, do v\u1eady t\u00f4i s\u1ebd \u0111i v\u00e0o c\u1ee5 th\u1ec3 t\u1eebng ph\u1ea7n \u0111\u1ec3 d\u1ec5 hi\u1ec3u h\u01a1n.<\/p>\n\n\n\n<ol><li><strong>PR(Tn)<\/strong> &#8211; M\u1ed7i trang c\u00f3 t\u1ea7m quan tr\u1ecdng c\u1ee7a ri\u00eang n\u00f3. PR(T1) l\u00e0 PageRank c\u1ee7a trang \u0111\u1ea7u ti\u00ean T1, c\u00f2n PR(Tn) l\u00e0 PageRank c\u1ee7a trang cu\u1ed1i c\u00f9ng Tn<\/li><li><strong>C(Tn) &#8211;&nbsp;<\/strong>M\u1ed7i trang chia \u0111\u1ec1u phi\u1ebfu b\u1ea7u c\u1ee7a h\u1ecd cho t\u1ea5t c\u1ea3 c\u00e1c link h\u01b0\u1edbng ra ngo\u00e0i c\u1ee7a n\u00f3. V\u1ec1 m\u1eb7t s\u1ed1 l\u01b0\u1ee3ng C(T1) l\u00e0 s\u1ed1 l\u01b0\u1ee3ng link tr\u1ecf ra b\u00ean ngo\u00e0i c\u1ee7a trang T1, C(Tn) l\u00e0 s\u1ed1 l\u01b0\u1ee3ng link tr\u1ecf ra b\u00ean ngo\u00e0i c\u1ee7a trang Tn. L\u01b0u \u00fd: C(Tn) bao g\u1ed3m c\u1ea3 li\u00ean k\u1ebft n\u1ed9i b\u1ed9 (internal link) v\u00e0 li\u00ean k\u1ebft tr\u1ecf ra h\u1eb3n b\u00ean ngo\u00e0i website (external link)<\/li><li><strong>PR(Tn)\/C(Tn)&nbsp;<\/strong>&#8211; V\u00ec th\u1ebf n\u1ebfu trang c\u1ee7a ch\u00fang ta (trang A) c\u00f3 backlink t\u1eeb trang &#8220;Tn&#8221;, s\u1ee9c m\u1ea1nh m\u00e0 trang A nh\u1eadn \u0111\u01b0\u1ee3c s\u1ebd l\u00e0 PR(Tn)\/C(Tn); t\u1ee9c l\u00e0 gi\u00e1 tr\u1ecb PR c\u1ee7a trang Tn chia \u0111\u1ec1u cho c\u00e1c li\u00ean k\u1ebft tr\u1ecf ra ngo\u00e0i c\u1ee7a trang Tn<\/li><li><strong>d(&#8230;<\/strong> &#8211; T\u1ea5t c\u1ea3 c\u00e1c li\u00ean k\u1ebft tr\u1ecf \u0111\u1ebfn \u0111\u01b0\u1ee3c h\u1ee3p th\u00e0nh v\u1edbi nhau, nh\u01b0ng \u0111\u1ec3 ng\u0103n c\u00e1c trang kh\u00e1c c\u00f3 qu\u00e1 nhi\u1ec1u \u1ea3nh h\u01b0\u1edfng, t\u1ed5ng l\u01b0\u1ee3ng phi\u1ebfu b\u1ea7u n\u00e0y \u0111\u01b0\u1ee3c &#8220;gi\u1ea3m b\u1edbt xu\u1ed1ng&#8221; b\u1eb1ng c\u00e1ch nh\u00e2n n\u00f3 v\u1edbi 0,85 (tham s\u1ed1 &#8220;d&#8221;)<\/li><li><strong>(1-d)<\/strong> &#8211; m\u1ed9t gi\u00e1 tr\u1ecb nh\u1ecf (1-d) \u1edf \u0111\u1ea7u ph\u01b0\u01a1ng tr\u00ecnh l\u00e0 gi\u00e1 tr\u1ecb nh\u1ecf cho t\u00ednh to\u00e1n x\u00e1c su\u1ea5t, v\u00ec th\u1ebf &#8220;t<em>\u1ed5ng PageRank c\u1ee7a t\u1ea5t c\u1ea3 c\u00e1c trang web s\u1ebd l\u00e0 m\u1ed9t<\/em>&#8220;: n\u00f3 th\u00eam m\u1ecdt ch\u00fat gi\u00e1 tr\u1ecb b\u1ecb m\u1ea5t b\u1edfi ph\u00e9p t\u00ednh <strong>d(&#8230;<\/strong> N\u00f3 c\u0169ng c\u00f3 ngh\u0129a l\u00e0 n\u1ebfu m\u1ed9t trang kh\u00f4ng c\u00f3 b\u1ea5t c\u1ee9 li\u00ean k\u1ebft n\u00e0o tr\u1ecf t\u1edbi n\u00f3 (kh\u00f4ng c\u00f3 backlink) th\u00ec th\u1eadm ch\u00ed khi \u1ea5y n\u00f3 v\u1eabn s\u1ebd nh\u1eadn \u0111\u01b0\u1ee3c gi\u00e1 tr\u1ecb PR nh\u1ecf l\u00e0 0,15 (v\u00ed d\u1ee5 1- 0,85). (Ngo\u00e0i l\u1ec1&#8221; T\u00e0i li\u1ec7u t\u1eeb Google n\u00f3i r\u1eb1ng &#8220;t\u1ed5ng t\u1ea5t c\u1ea3 c\u00e1c trang web&#8221; nh\u01b0ng ch\u00fang c\u00f3 ngh\u0129a l\u00e0 &#8220;t\u1ed5ng chu\u1ea9n h\u00f3a \/ the normalised sum&#8221; &#8211; hay c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 &#8220;trung b\u00ecnh&#8221; \u0111\u1ed1i v\u1edbi b\u1ea1n v\u00e0 t\u00f4i).<\/li><\/ol>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_PageRank_duoc_tinh_toan_nhu_the_nao\"><\/span>#4. PageRank \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n nh\u01b0 th\u1ebf n\u00e0o?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u1ede \u0111\u00e2y c\u00f3 m\u1ed9t v\u1ea5n \u0111\u1ec1 k\u1ef3 l\u1ea1. PR c\u1ee7a m\u1ed9t trang ph\u1ee5 thu\u1ed9c v\u00e0o PR c\u1ee7a c\u00e1c trang tr\u1ecf t\u1edbi n\u00f3. Nh\u01b0ng ch\u00fang ta l\u1ea1i kh\u00f4ng bi\u1ebft PR c\u1ee7a nh\u1eefng trang \u0111\u00f3 cho \u0111\u1ebfn khi c\u00e1c trang tr\u1ecf t\u1edbi <strong>ch\u00fang<\/strong> c\u00f3 gi\u00e1 tr\u1ecb PR \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n c\u1ee5 th\u1ec3 v\u00e0 c\u1ee9 ti\u1ebfp t\u1ee5c nh\u01b0 v\u1eady (v\u00f2ng l\u1eb7p v\u00f4 t\u1eadn c\u1ee7a \u0111i\u1ec1u kh\u00f4ng bi\u1ebft)&#8230; V\u00e0 khi b\u1ea1n xem x\u00e9t chuy\u1ec7n trang c\u00f3 th\u1ec3 li\u00ean k\u1ebft d\u01b0\u1edbi d\u1ea1ng v\u00f2ng tr\u00f2n l\u00e0m cho n\u00f3 d\u01b0\u1eddng nh\u01b0 kh\u00f4ng th\u1ec3 t\u00ednh to\u00e1n n\u1ed5i!<\/p>\n\n\n\n<p>Nh\u01b0ng s\u1ef1 th\u1ef1c th\u00ec n\u00f3 kh\u00f4ng t\u1ec7 nh\u01b0 th\u1ebf. C\u1ea7n nh\u1edb l\u1ea1i \u0111i\u1ec1u n\u00e0y trong t\u00e0i li\u1ec7u g\u1ed1c c\u1ee7a Google:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p>PageRank hay PR(A) c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n d\u01b0\u1edbi d\u1ea1ng m\u1ed9t v\u00f2ng l\u1eb7p \u0111\u01a1n gi\u1ea3n (simple iterative algorithm),v\u00e0 t\u01b0\u01a1ng \u1ee9ng v\u1edbi h\u00e0m ri\u00eang c\u1ee7a ma tr\u1eadn li\u00ean k\u1ebft chu\u1ea9n h\u00f3a c\u1ee7a web.<\/p><\/blockquote>\n\n\n\n<p>Nghe v\u1eabn kh\u00f3 hi\u1ec3u (\u0111\u00fang h\u01a1n \u0111\u1ed1i v\u1edbi ng\u01b0\u1eddi d\u1ecbch l\u00e0 kh\u00f4ng hi\u1ec3u g\u00ec!), nh\u01b0ng \u0111i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 <strong>ch\u00fang ta c\u00f3 th\u1ec3 t\u00ednh to\u00e1n PR c\u1ee7a m\u1ed9t trang m\u00e0 kh\u00f4ng c\u1ea7n bi\u1ebft gi\u00e1 tr\u1ecb PR c\u1ee7a c\u00e1c trang kh\u00e1c<\/strong> (\u0111o\u1ea1n n\u00e0y th\u00ec t\u00f4i ho\u00e0n to\u00e0n hi\u1ec3u \u0111\u01b0\u1ee3c). \u0110i\u1ec1u n\u00e0y tho\u1ea1t nh\u00ecn c\u00f3 v\u1ebb k\u1ef3 l\u1ea1, nh\u01b0ng v\u1ec1 c\u01a1 b\u1ea3n, m\u1ed7i l\u1ea7n ch\u00fang ta ch\u1ea1y t\u00ednh to\u00e1n, ch\u00fang ta s\u1ebd c\u00f3 \u0111\u01b0\u1ee3c gi\u00e1 tr\u1ecb g\u1ea7n \u0111\u00fang c\u1ee7a gi\u00e1 tr\u1ecb cu\u1ed1i c\u00f9ng. V\u00ec th\u1ebf t\u1ea5t c\u1ea3 \u0111i\u1ec1u ch\u00fang ta c\u1ea7n l\u00e0m l\u00e0 ghi nh\u1edb m\u1ed7i gi\u00e1 tr\u1ecb ch\u00fang ta t\u00ednh to\u00e1n v\u00e0 l\u1eb7p l\u1ea1i t\u00ednh to\u00e1n nhi\u1ec1u l\u1ea7n cho \u0111\u1ebfn khi gi\u00e1 tr\u1ecb ng\u1eebng thay \u0111\u1ed5i qu\u00e1 nhi\u1ec1u.<\/p>\n\n\n\n<p>H\u00e3y th\u1eed v\u1edbi v\u00ed d\u1ee5 v\u1ec1 m\u1ed9t m\u1ea1ng \u0111\u01a1n gi\u1ea3n nh\u1ea5t: g\u1ed3m hai trang, m\u1ed7i trang \u0111\u1ec1u tr\u1ecf t\u1edbi trang kia:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"227\" height=\"51\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/08\/2-trang-tro-den-nhau.gif\" alt=\"2 trang tr\u1ecf v\u00e0o nhau\" class=\"wp-image-12703\"\/><\/figure><\/div>\n\n\n<p>M\u1ed7i trang c\u00f3 m\u1ed9t li\u00ean k\u1ebft ngo\u00e0i (s\u1ed1 l\u01b0\u1ee3ng li\u00ean k\u1ebft ngo\u00e0i l\u00e0 1, \u1edf \u0111\u00e2y, C(A)=1 v\u00e0 C(B)=1)<\/p>\n\n\n\n<p><strong>G\u00e1n gi\u00e1 tr\u1ecb l\u1ea7n 1<\/strong><\/p>\n\n\n\n<p>Ch\u00fang ta kh\u00f4ng bi\u1ebft gi\u00e1 tr\u1ecb PR n\u00ean c\u00f3 l\u00fac ban \u0111\u1ea7u, v\u00ec th\u1ebf gi\u1ea3 s\u1eed ch\u00fang ta b\u1eaft \u0111\u1ea7u v\u1edbi gi\u00e1 tr\u1ecb l\u00e0 1 v\u00e0 ti\u1ebfn h\u00e0nh m\u1ed9t s\u1ed1 t\u00ednh to\u00e1n:<\/p>\n\n\n\n<ul><li>d = 0,85<\/li><li>PR(A) = (1-d) + d (PR(B)\/1)<\/li><li>PR(B) = (1-d) + d (PR(A)\/1)<\/li><\/ul>\n\n\n\n<p>Gi\u00e1 tr\u1ecb c\u1ee5 th\u1ec3 s\u1ebd l\u00e0:<\/p>\n\n\n\n<ul><li>PR(A) = 0,15 + 0,85 * 1 = 1<\/li><li>PR(B) = 0,15 + 0,85*1 = 1<\/li><\/ul>\n\n\n\n<p>H\u1eebm, c\u00e1c con s\u1ed1 ch\u1eb3ng thay \u0111\u1ed5i ch\u00fat n\u00e0o! V\u00ec th\u1ebf c\u00f3 v\u1ebb nh\u01b0 ch\u00fang ta \u0111\u00e3 b\u1eaft \u0111\u1ea7u v\u1edbi m\u1ed9t d\u1ef1 \u0111o\u00e1n \u0111\u1ea7y may m\u1eafn r\u1ed3i!!!<\/p>\n\n\n\n<p><strong>G\u00e1n gi\u00e1 tr\u1ecb l\u1ea7n 2<\/strong><\/p>\n\n\n\n<p>Kh\u00f4ng, \u0111i\u1ec1u n\u00e0y l\u00e0 qu\u00e1 d\u1ec5 d\u00e0ng, c\u00f3 th\u1ec3 t\u00f4i \u0111\u00e3 sai (v\u00e0 n\u00f3 ch\u1eb3ng ph\u1ea3i l\u00e0 l\u1ea7n \u0111\u1ea7u ti\u00ean). OK, h\u00e3y th\u1eed b\u1eaft \u0111\u1ea7u v\u1edbi d\u1ef1 \u0111o\u00e1n t\u1ea1i 0 v\u00e0 t\u00ednh to\u00e1n l\u1ea1i:<\/p>\n\n\n\n<ul><li>PR(A) = 0,15 + 0,85 * 0 = 0,15<\/li><li>PR(B) = 0,15 + 0,85 * 0,15 = 0,2775<\/li><\/ul>\n\n\n\n<p>Ghi ch\u00fa: PR(B) ban \u0111\u1ea7u \u0111\u01b0\u1ee3c g\u00e1n gi\u00e1 tr\u1ecb l\u00e0 0 \u0111\u1ec3 t\u00ednh to\u00e1n ra PR(A). Sau \u0111\u00f3 ch\u00ednh gi\u00e1 tr\u1ecb PR(A) n\u00e0y l\u1ea1i \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec1 t\u00ednh l\u1ea1i PR(B).<\/p>\n\n\n\n<p>Th\u00eam m\u1ed9t v\u00f2ng l\u1eb7p n\u1eefa (l\u1ea7n 2):<\/p>\n\n\n\n<ul><li>PR(A) = 0,15 + 0,85 * 0,2775 = 0,385875<\/li><li>PR(B) = 0,15 + 0,85 * 0,385875 = 0,47799375<\/li><\/ul>\n\n\n\n<p>Ti\u1ebfp t\u1ee5c l\u1eb7p l\u1ea1i (l\u1ea7n 3):<\/p>\n\n\n\n<ul><li>PR(A) = 0,15 + 0,85 * 0,47799375 = 0,5562946875<\/li><li>PR(B) = 0,15 + 0,85 * 0,5562946875 = 0,622850484375<\/li><\/ul>\n\n\n\n<p>L\u1ea7n 4:<\/p>\n\n\n\n<ul><li>PR(A) = 0,15 + 0,85 * 0,622850484375 = 0,67942291171<\/li><li>PR(B) = 0,15 + 0,85 * 0,67942291171 = 0,72750947495<\/li><\/ul>\n\n\n\n<p>L\u1ea7n 5:<\/p>\n\n\n\n<ul><li>PR(A) = 0,15 + 0,85 * 0,72750947495 = 0,7683830537<\/li><li>PR(B) = 0.15 + 0.85 * 0,7683830537 = 0,80312559564<\/li><\/ul>\n\n\n\n<p>V\u00e0 c\u1ee9 ti\u1ebfp t\u1ee5c t\u00ednh nh\u01b0 v\u1eady. Gi\u00e1 tr\u1ecb c\u1ee9 ti\u1ebfp t\u1ee5c t\u0103ng. Nh\u01b0ng c\u00e1c con s\u1ed1 s\u1ebd ng\u1eebng t\u0103ng khi ch\u00fang nh\u1eadn gi\u00e1 tr\u1ecb 1,0? \u0110i\u1ec1u g\u00ec s\u1ebd x\u1ea3y ra khi ch\u00fang ta t\u00ednh v\u01b0\u1ee3t m\u1ee9c gi\u00e1 tr\u1ecb ban \u0111\u1ea7u l\u00e0 1,0?<\/p>\n\n\n\n<p><strong>G\u00e1n gi\u00e1 tr\u1ecb l\u1ea7n 3<\/strong><\/p>\n\n\n\n<p>Gi\u1edd ch\u00fang ta gi\u1ea3 d\u1ee5 m\u1ed7i c\u00e1i c\u00f3 gi\u00e1 tr\u1ecb l\u00e0 40, h\u00e3y l\u00e0m v\u00e0i v\u00f2ng l\u1eb7p xem th\u1ebf n\u00e0o:<\/p>\n\n\n\n<ul><li>PR(A) = 40<\/li><li>PR(B) = 40<\/li><\/ul>\n\n\n\n<p>T\u00ednh to\u00e1n l\u1ea7n \u0111\u1ea7u:<\/p>\n\n\n\n<ul><li>PR(A) = 0,15 + 0,85 * 40 = 34,15<\/li><li>PR(B) = 0,15 + 0,85 * 34,15 = 29,1775<\/li><\/ul>\n\n\n\n<p>L\u1ea7n th\u1ee9 2:<\/p>\n\n\n\n<ul><li>PR(A) = 0,15 + 0,85 * 29,1775 = 24,950875<\/li><li>PR(B) = 0,15 + 0,85 * 24,950875 = 21,35824375<\/li><\/ul>\n\n\n\n<p>L\u1ea7n th\u1ee9 3:<\/p>\n\n\n\n<ul><li>PR(A) = 0,15 + 0,85 * 21,35824375 = 18,3045071875<\/li><li>PR(B) = 0,15 + 0,85 * 18,3045071875 = 15,7088311094<\/li><\/ul>\n\n\n\n<p>L\u1ea7n th\u1ee9 4:<\/p>\n\n\n\n<ul><li>PR(A) = 0,15 + 0,85 * 15,7088311094 = 13,502506443<\/li><li>PR(B) = 0,15 + 0,85 * 13,502506443 = 11,6271304766<\/li><\/ul>\n\n\n\n<p>L\u1ea7n th\u1ee9 5:<\/p>\n\n\n\n<ul><li>PR(A) = 0,15 + 0,85 * 11,6271304766 = 10,0330609051<\/li><li>PR(B) = 0,15 + 0,85 * 10,0330609051 = 8,67810176933<\/li><\/ul>\n\n\n\n<p>\u0110\u00fang v\u1eady, c\u00e1c gi\u00e1 tr\u1ecb \u0111\u00f3 \u0111ang gi\u1ea3m d\u1ea7n! Ch\u1eafc ch\u1eafn c\u00e1c con s\u1ed1 s\u1ebd \u0111\u1ea1t gi\u00e1 tr\u1ecb \u1edf 1.0 v\u00e0 d\u1eebng l\u1ea1i.<\/p>\n\n\n\n<p><strong>Nguy\u00ean l\u00fd<\/strong>: kh\u00f4ng th\u00e0nh v\u1ea5n \u0111\u1ec1 l\u00e0 b\u1ea1n kh\u1edfi t\u1ea1o gi\u00e1 tr\u1ecb d\u1ef1 \u0111o\u00e1n ban \u0111\u1ea7u l\u00e0 bao nhi\u00eau, m\u1ed9t khi PageRank \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n \u1ed5n \u0111\u1ecbnh, th\u00ec gi\u00e1 tr\u1ecb &#8220;ph\u00e2n ph\u1ed1i x\u00e1c su\u1ea5t chu\u1ea9n h\u00f3a&#8221; (gi\u00e1 tr\u1ecb PageRank trung b\u00ecnh c\u1ee7a t\u1ea5t c\u1ea3 c\u00e1c trang) s\u1ebd l\u00e0 1.0<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Nhan_duoc_cau_tra_loi_nhanh\"><\/span>#5. Nh\u1eadn \u0111\u01b0\u1ee3c c\u00e2u tr\u1ea3 l\u1eddi nhanh<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>V\u00f2ng l\u1eb7p c\u1ea7n ph\u1ea3i l\u1eb7p l\u1ea1i bao nhi\u00eau l\u1ea7n khi ch\u00fang ta t\u00ednh to\u00e1n v\u1edbi m\u1ed9t m\u1ea1ng l\u01b0\u1edbi kh\u1ed5ng l\u1ed3? \u0110\u00e2y l\u00e0 m\u1ed9t c\u00e2u h\u1ecfi kh\u00f3; v\u1edbi m\u1ed9t m\u1ea1ng l\u01b0\u1edbi r\u1ea5t l\u1edbn nh\u01b0 World Wide Web n\u00f3 c\u00f3 th\u1ec3 l\u00e0 nhi\u1ec1u tri\u1ec7u v\u00f2ng l\u1eb7p! Gi\u00e1 tr\u1ecb c\u1ee7a &#8220;tham s\u1ed1 gi\u1ea3m tr\u1eeb&#8221; l\u00e0 kh\u00e1 tinh t\u1ebf. N\u1ebfu n\u00f3 qu\u00e1 cao s\u1ebd d\u1eabn \u0111\u1ebfn vi\u1ec7c m\u1ea5t nhi\u1ec1u th\u1eddi gian \u0111\u1ec3 gi\u1ea3i quy\u1ebft, n\u1ebfu n\u00f3 qu\u00e1 th\u1ea5p th\u00ec b\u1ea1n s\u1ebd v\u01b0\u1ee3t ng\u01b0\u1ee1ng l\u1eb7p \u0111i l\u1eb7p l\u1ea1i, c\u1ea3 gi\u00e1 tr\u1ecb cao v\u00e0 th\u1ea5p h\u01a1n so v\u1edbi trung b\u00ecnh &#8211; c\u00e1c con s\u1ed1 s\u1ebd dao \u0111\u1ed9ng nh\u01b0 con l\u1eafc v\u00e0 kh\u00f4ng bao gi\u1edd c\u1ed1 \u0111\u1ecbnh l\u1ea1i.<\/p>\n\n\n\n<p>Ngo\u00e0i ra vi\u1ec7c l\u1ef1a ch\u1ecdn th\u1ee9 t\u1ef1 t\u00ednh to\u00e1n c\u00f3 th\u1ec3 h\u1eefu \u00edch. C\u00e2u tr\u1ea3 l\u1eddi s\u1ebd gi\u1ed1ng nhau &#8211; kh\u00f4ng th\u00e0nh v\u1ea5n \u0111\u1ec1 th\u1ee9 t\u1ef1 b\u1ea1n ch\u1ecdn nh\u01b0 th\u1ebf n\u00e0o, nh\u01b0ng m\u1ed9t s\u1ed1 th\u1ee9 t\u1ef1 s\u1ebd gi\u00fap b\u1ea1n ti\u1ebfn h\u00e0nh nhanh h\u01a1n so v\u1edbi nh\u1eefng c\u00e1i kh\u00e1c.<\/p>\n\n\n\n<p>T\u00f4i ch\u1eafc ch\u1eafn r\u1eb1ng c\u00f3 m\u1ed9t s\u1ed1 lu\u1eadn \u00e1n th\u1ea1c s\u1ef9 v\u1ec1 c\u00e1ch t\u00ednh to\u00e1n c\u00e1i n\u00e0y sao cho hi\u1ec7u qu\u1ea3 nh\u1ea5t c\u00f3 th\u1ec3, nh\u01b0ng trong c\u00e1c v\u00ed d\u1ee5 b\u00ean d\u01b0\u1edbi, t\u00f4i s\u1eed d\u1ee5ng \u0111o\u1ea1n m\u00e3 r\u1ea5t \u0111\u01a1n gian \u0111\u1ec3 t\u00ednh to\u00e1n g\u1ea7n \u0111\u00fang v\u1edbi 20 \u0111\u1ebfn 40 v\u00f2ng l\u1eb7p!<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"6_Cac_vi_du\"><\/span>#6. C\u00e1c v\u00ed d\u1ee5<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Ch\u00fang ta s\u1ebd \u0111i qua c\u00e1c v\u00ed d\u1ee5 \u0111\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 PageRank:<\/p>\n\n\n\n<p><strong>V\u00ed d\u1ee5 1<\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"319\" height=\"229\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/08\/vi-du-tinh-pagerank.gif\" alt=\"v\u00ed d\u1ee5 1 t\u00ednh pagerank\" class=\"wp-image-12704\"\/><\/figure><\/div>\n\n\n<p>T\u00f4i kh\u00f4ng l\u1eb7p l\u1ea1i t\u00ednh to\u00e1n \u1edf \u0111\u00e2y, m\u00e0 ch\u1ec9 tr\u01b0ng ra k\u1ebft qu\u1ea3 lu\u00f4n, c\u00e1c gi\u00e1 tr\u1ecb PR ch\u00ednh x\u00e1c cho v\u00ed d\u1ee5 n\u00e0y l\u00e0:<\/p>\n\n\n<div class=\"wp-block-image wp-image-12705 size-full\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"428\" height=\"229\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/08\/ket-qua-PR-vidu1.gif\" alt=\"k\u1ebft qu\u1ea3 PR, v\u00ed d\u1ee5 1\" class=\"wp-image-12705\"\/><figcaption>Gi\u00e1 tr\u1ecb PR trung b\u00ecnh l\u00e0 1<\/figcaption><\/figure><\/div>\n\n\n<p>V\u1edbi m\u1ea1ng n\u00e0y, t\u00f4i ch\u1ec9 c\u1ea7n 20 l\u1ea7n l\u1eb7p \u0111\u1ec3 c\u00e1c gi\u00e1 tr\u1ecb tr\u1edf n\u00ean \u1ed5n \u0111\u1ecbnh!<\/p>\n\n\n\n<p>H\u00e3y nh\u00ecn v\u00e0o trang D &#8211; n\u00f3 c\u00f3 PR l\u00e0 0,15 v\u00ec ch\u1eb3ng c\u00f3 ai b\u1ea7u cho n\u00f3 c\u1ea3 (kh\u00f4ng c\u00f3 li\u00ean k\u1ebft n\u00e0o tr\u1ecf \u0111\u1ebfn), li\u1ec7u con s\u1ed1 n\u00e0y c\u00f3 \u0111\u00fang kh\u00f4ng?<\/p>\n\n\n\n<p>H\u00e3y xem l\u1ea1i c\u00f4ng th\u1ee9c t\u00ednh:<\/p>\n\n\n\n<p>PR(D) = (1-d) + <i>d (PR(T1)\/C(T1) + &#8230; + PR(Tn)\/C(Tn))<\/i><\/p>\n\n\n\n<p>Nh\u01b0ng v\u00ec trang D kh\u00f4ng c\u00f3 backlink n\u00e0o c\u1ea3, \u0111i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 ph\u01b0\u01a1ng tr\u00ecnh s\u1ebd th\u00e0nh th\u1ebf n\u00e0y:<\/p>\n\n\n\n<p>PR(D) = (1-d) + d*(0) = 0,15<\/p>\n\n\n\n<p>Kh\u00f4ng th\u00e0nh v\u1ea5n \u0111\u1ec1 b\u1ea1n t\u00ednh to\u00e1n n\u00f3 bao nhi\u00eau l\u1ea7n.<\/p>\n\n\n\n<p><strong>\u0110i\u1ec1u quan s\u00e1t \u0111\u01b0\u1ee3c<\/strong>: m\u1ed7i trang c\u00f3 PR \u00edt nh\u1ea5t l\u00e0 0,15. Nh\u01b0ng \u0111i\u1ec1u n\u00e0y ch\u1ec9 l\u00e0 l\u00fd thuy\u1ebft &#8211; c\u00f3 tin \u0111\u1ed3n cho r\u1eb1ng, Google c\u00f2n th\u1ef1c hi\u1ec7n giai \u0111o\u1ea1n h\u1eadu ki\u1ec3m, khi \u0111\u00f3 b\u1ea5t c\u1ee9 trang n\u00e0o kh\u00f4ng c\u00f3 li\u00ean k\u1ebft tr\u1ecf \u0111\u1ebfn s\u1ebd b\u1ecb x\u00f3a b\u1ecf ho\u00e0n to\u00e0n kh\u1ecfi ch\u1ec9 m\u1ee5c&#8230;<\/p>\n\n\n\n<div class=\"wp-block-stevehenty-drop-shadow-box dropshadowboxes-container\" style=\"width:auto\"><div class=\"dropshadowboxes-drop-shadow dropshadowboxes-lifted-both dropshadowboxes-rounded-corners dropshadowboxes-inside-and-outside-shadow\" style=\"background-color:#ffffff;border-style:solid;border-width:2px;border-color:#dddddd;width:;padding:10px\"><div>\n<p>Li\u1ec7u nh\u00ecn v\u00e0o s\u01a1 \u0111\u1ed3 tr\u00ean b\u1ea1n c\u00f3 \u0111o\u00e1n \u0111\u01b0\u1ee3c th\u1ee9 t\u1ef1 PR c\u1ee7a t\u1eebng trang hay kh\u00f4ng? Ch\u1ec9 c\u1ea7n c\u0103n c\u1ee9 v\u00e0o ch\u1ea5t l\u01b0\u1ee3ng v\u00e0 s\u1ed1 l\u01b0\u1ee3ng c\u00e1c li\u00ean k\u1ebft tr\u1ecf \u0111\u1ebfn c\u1ee7a t\u1eebng trang.<\/p>\n\n\n\n<p>\u0110\u1ec3 t\u00f4i th\u1eed nh\u00e9:<\/p>\n\n\n\n<ul><li>Trang C s\u1ebd c\u00f3 PR cao nh\u1ea5t v\u00ec n\u00f3 c\u00f3 nhi\u1ec1u li\u00ean k\u1ebft tr\u1ecf \u0111\u1ebfn nh\u1ea5t, v\u00e0 \u0111\u01b0\u1ee3c t\u1ea5t c\u1ea3 c\u00e1c trang trong h\u1ec7 th\u1ed1ng tr\u1ecf \u0111\u1ebfn<\/li><li>Trang D s\u1ebd c\u00f3 PR th\u1ea5p nh\u1ea5t v\u00ec n\u00f3 kh\u00f4ng c\u00f3 li\u00ean k\u1ebft n\u00e0o tr\u1ecf \u0111\u1ebfn<\/li><li>Trang A s\u1ebd c\u00f3 PR cao h\u01a1n trang B, v\u00ec tr\u1ecf \u0111\u1ebfn trang A l\u00e0 trang C, trang c\u00f3 PR cao nh\u1ea5t; trong khi tr\u1ecf \u0111\u1ebfn trang B ch\u1ec9 c\u00f3 trang A, ch\u1eafc ch\u1eafn c\u00f3 PR th\u1ea5p h\u01a1n trang C<\/li><\/ul>\n<\/div><\/div><\/div>\n\n\n\n<p><strong>V\u00ed d\u1ee5 2<\/strong><\/p>\n\n\n\n<p>M\u1ed9t ph\u00e2n c\u1ea5p \u0111\u01a1n gi\u1ea3n v\u1edbi m\u1ed9t s\u1ed1 li\u00ean k\u1ebft tr\u1ecf ra b\u00ean ngo\u00e0i.<\/p>\n\n\n\n<ul><li>Home: trang ch\u1ee7<\/li><li>About: trang gi\u1edbi thi\u1ec7u<\/li><li>Product: trang s\u1ea3n ph\u1ea9m<\/li><li>Links: c\u00e1c b\u00e0i vi\u1ebft th\u00f4ng th\u01b0\u1eddng<\/li><li>External Site: trang thu\u1ed9c h\u1ec7 th\u1ed1ng b\u00ean ngo\u00e0i, \u1edf \u0111\u00e2y c\u00f3 4 trang l\u00e0 A, B, C, D<\/li><\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"429\" height=\"235\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/08\/vidu2-pagerank.gif\" alt=\"v\u00ed d\u1ee5 2 - pagerank\" class=\"wp-image-12708\"\/><\/figure><\/div>\n\n\n<p>K\u1ebft qu\u1ea3:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"493\" height=\"235\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/08\/vidu2-pagerank-ketqua.gif\" alt=\"v\u00ed d\u1ee5 2 - k\u1ebft qu\u1ea3 pagerank\" class=\"wp-image-12709\"\/><\/figure><\/div>\n\n\n<p>Gi\u1ed1ng nh\u01b0 b\u1ea1n \u0111o\u00e1n, trang ch\u1ee7 c\u00f3 ch\u1ec9 s\u1ed1 PR cao nh\u1ea5t &#8211; suy cho c\u00f9ng, n\u00f3 l\u00e0 trang nh\u1eadn \u0111\u01b0\u1ee3c nhi\u1ec1u li\u00ean k\u1ebft \u0111\u1ebfn nh\u1ea5t! Nh\u01b0ng \u0111i\u1ec1u g\u00ec \u0111\u00e3 x\u1ea3y ra v\u1edbi con s\u1ed1 trung b\u00ecnh? N\u00f3 ch\u1ec9 c\u00f3 gi\u00e1 tr\u1ecb l\u00e0 0,378!!! \u0110i\u1ec1u n\u00e0y kh\u00f4ng \u0111\u00fang v\u1edbi nh\u1eefng g\u00ec t\u00f4i n\u00f3i tr\u01b0\u1edbc \u0111\u00f3, do v\u1eady, h\u1eb3n c\u00f3 \u0111i\u1ec1u g\u00ec \u0111\u00f3 sai \u1edf \u0111\u00e2y!<\/p>\n\n\n\n<p>\u00c0, kh\u00f4ng, m\u1ecdi th\u1ee9 v\u1eabn \u1ed5n. Nh\u01b0ng h\u00e3y nh\u00ecn v\u00e0o c\u00e1c trang b\u00ean ngo\u00e0i &#8211; \u0111i\u1ec1u g\u00ec x\u1ea3y ra v\u1edbi PageRank c\u1ee7a ch\u00fang v\u1eady? Ch\u00fang kh\u00f4ng b\u1ea7u cho b\u1ea5t c\u1ee9 trang n\u00e0o kh\u00e1c, ch\u00fang \u0111ang l\u00e0m l\u00e3ng ph\u00ed PR c\u1ee7a ch\u00ednh ch\u00fang!<\/p>\n\n\n\n<p><strong>V\u00ed d\u1ee5 3<\/strong><\/p>\n\n\n\n<p>B\u00e2y gi\u1edd ch\u00fang ta th\u1eed li\u00ean k\u1ebft nh\u1eefng trang b\u00ean ngo\u00e0i n\u00e0y tr\u1edf l\u1ea1i trang ch\u1ee7 \u0111\u1ec3 xem \u0111i\u1ec1u g\u00ec x\u1ea3y ra v\u1edbi con s\u1ed1 trung b\u00ecnh&#8230;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"527\" height=\"312\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/08\/vidu3-pagerank.gif\" alt=\"v\u00ed d\u1ee5 3 v\u1ec1 pagerank\" class=\"wp-image-12712\"\/><\/figure><\/div>\n\n\n<p>C\u00f3 v\u1ebb t\u1ed1t h\u01a1n &#8211; cu\u1ed1i c\u00f9ng th\u00ec n\u00f3 c\u0169ng ho\u1ea1t \u0111\u1ed9ng! V\u00e0 h\u00e3y nh\u00ecn v\u00e0o ch\u1ec9 s\u1ed1 PR c\u1ee7a trang ch\u1ee7! T\u1ea5t c\u1ea3 c\u00e1c li\u00ean k\u1ebft tr\u1ecf \u0111\u1ebfn ch\u1eafc ch\u1eafn t\u1ea1o ra s\u1ef1 kh\u00e1c bi\u1ec7t &#8211; ch\u00fang ta s\u1ebd n\u00f3i r\u00f5 h\u01a1n \u1edf ph\u1ea7n sau.<\/p>\n\n\n\n<p><strong>V\u00ed d\u1ee5 4<\/strong><\/p>\n\n\n\n<p>\u0110i\u1ec1u g\u00ec x\u1ea3y ra cho ch\u1ec9 s\u1ed1 PR n\u1ebfu ch\u00fang ta l\u00e0m theo g\u1ee3i \u00fd v\u1ec1 vi\u1ec7c vi\u1ebft trang \u0111\u00e1nh gi\u00e1?<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"459\" height=\"370\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/08\/vidu4-pagerank.gif\" alt=\"v\u00ed d\u1ee5 4 v\u1ec1 pagerank\" class=\"wp-image-12713\"\/><\/figure><\/div>\n\n\n<p>K\u1ebft qu\u1ea3:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"457\" height=\"370\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/08\/ketqua-vidu4-pagerank.gif\" alt=\"k\u1ebft qu\u1ea3 v\u00ed d\u1ee5 4 v\u1ec1 pagerank\" class=\"wp-image-12714\"\/><\/figure><\/div>\n\n\n<p><strong>V\u00ed d\u1ee5 5<\/strong><\/p>\n\n\n\n<p>M\u1ed9t v\u00ed d\u1ee5 ph\u00e2n c\u1ea5p \u0111\u01a1n gi\u1ea3n:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"236\" height=\"202\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/08\/vidu5-pagerank.gif\" alt=\"pagerank-vi-du-5\" class=\"wp-image-12706\"\/><\/figure><\/div>\n\n\n<p>Trang ch\u1ee7 c\u00f3 PR g\u1ea5p 2,5 l\u1ea7n PR c\u1ee7a c\u00e1c trang con! Th\u1eadt tuy\u1ec7t v\u1eddi!<\/p>\n\n\n\n<ul><li><strong>\u0110i\u1ec1u quan s\u00e1t \u0111\u01b0\u1ee3c<\/strong>: m\u1ed9t h\u1ec7 th\u1ed1ng b\u1ea7u ch\u1ecdn t\u1eadp trung ph\u00e2n c\u1ea5p v\u00e0 PR s\u1ebd t\u1eadp trung v\u00e0o m\u1ed9t trang<\/li><\/ul>\n\n\n\n<p><strong>V\u00ed d\u1ee5 6<\/strong><\/p>\n\n\n\n<p>V\u00f2ng l\u1eb7p (looping):<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"242\" height=\"177\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/08\/vidu6-pagerank.gif\" alt=\"v\u00ed d\u1ee5 6 v\u1ec1 pagerank\" class=\"wp-image-12715\"\/><\/figure><\/div>\n\n\n<p>\u0110\u00e2y l\u00e0 k\u1ebft qu\u1ea3 m\u00e0 ch\u00fang ta mong ch\u1edd. T\u1ea5t c\u1ea3 c\u00e1c trang c\u00f3 c\u00f9ng s\u1ed1 l\u01b0\u1ee3ng li\u00ean k\u1ebft tr\u1ecf \u0111\u1ebfn, t\u1ea5t c\u1ea3 c\u00e1c trang c\u00f3 m\u1ee9c \u0111\u1ed9 quan tr\u1ecdng ngang b\u1eb1ng v\u1edbi c\u00e1c trang kh\u00e1c, t\u1ea5t c\u1ea3 c\u00e1c trang c\u00f3 c\u00f9ng ch\u1ec9 s\u1ed1 PR l\u00e0 1,0<\/p>\n\n\n\n<p><strong>V\u00ed d\u1ee5 7<\/strong><\/p>\n\n\n\n<p>Li\u00ean k\u1ebft d\u00e0y \u0111\u1eb7c (c\u00f2n g\u1ecdi l\u00e0 fully meshed):<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"241\" height=\"177\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/08\/vidu7-pagerank.gif\" alt=\"v\u00ed d\u1ee5 7 v\u1ec1 pagerank\" class=\"wp-image-12716\"\/><\/figure><\/div>\n\n\n<p>V\u00e2ng, k\u1ebft qu\u1ea3 t\u01b0\u01a1ng t\u1ef1 v\u1edbi v\u00f2ng l\u1eb7p \u1edf tr\u00ean v\u00ec c\u00e1c l\u00fd do t\u01b0\u01a1ng t\u1ef1.<\/p>\n\n\n\n<p><strong>V\u00ed d\u1ee5 8<\/strong><\/p>\n\n\n\n<p>Ph\u00e2n c\u1ea5p &#8211; nh\u01b0ng v\u1edbi m\u1ed9t li\u00ean k\u1ebft b\u00ean ngo\u00e0i tr\u1ecf \u0111\u1ebfn h\u1ec7 th\u1ed1ng v\u00e0 m\u1ed9t li\u00ean k\u1ebft t\u1eeb h\u1ec7 th\u1ed1ng tr\u1ecf ra ngo\u00e0i.<\/p>\n\n\n\n<p>Ch\u00fang ta gi\u1ea3 \u0111\u1ecbnh l\u00e0 c\u00f3 m\u1ed9t website b\u00ean ngo\u00e0i c\u00f3 r\u1ea5t nhi\u1ec1u trang v\u00e0 c\u00e1c li\u00ean k\u1ebft v\u1edbi k\u1ebft qu\u1ea3 l\u00e0 m\u1ed9t trong c\u00e1c trang c\u00f3 PR trung b\u00ecnh l\u00e0 1,0. Ch\u00fang ta c\u0169ng gi\u1ea3 \u0111\u1ecbnh l\u00e0 ch\u1ee7 website \u0111\u00f3 th\u1ef1c s\u1ef1 th\u00edch web c\u1ee7a ch\u00fang ta &#8211; do v\u1eady ng\u01b0\u1eddi n\u00e0y li\u00ean k\u1ebft t\u1eeb trang c\u1ee7a h\u1ecd (Site A c\u00f3 PR = 1) \u0111\u1ebfn trang ch\u1ee7 c\u1ee7a ch\u00fang ta.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"485\" height=\"202\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/08\/vidu8-pagerank.gif\" alt=\"v\u00ed d\u1ee5 8 v\u1ec1 pagerank\" class=\"wp-image-12717\"\/><\/figure><\/div>\n\n\n<p>&nbsp;Trong v\u00ed d\u1ee5 5, trang ch\u1ee7 ch\u1ec9 c\u00f3 PR l\u00e0 1,92 nh\u01b0ng gi\u1edd ch\u1ec9 s\u1ed1 c\u1ee7a n\u00f3 l\u00e0 3,31! Th\u1eadt tuy\u1ec7t v\u1eddi! \u0110i\u1ec1u \u0111\u00f3 kh\u00f4ng ch\u1ec9 v\u00ec site A \u0111\u00f3ng g\u00f3p 0,85 PR cho ch\u00fang ta, m\u00e0 c\u1ea3 vi\u1ec7c t\u0103ng PR \u1edf c\u00e1c trang &#8220;About&#8221;, &#8220;Product&#8221;, &#8220;More&#8221; \u0111\u00e3 \u0111em l\u1ea1i hi\u1ec7u \u1ee9ng ph\u1ea3n h\u1ed3i t\u1ed1t \u0111\u1eb9p, \u0111\u1ea9y ch\u1ec9 s\u1ed1 PR c\u1ee7a trang ch\u1ee7 th\u1eadm ch\u1ec9 c\u00f2n l\u00ean cao h\u01a1n!<\/p>\n\n\n\n<ul><li><strong>Nguy\u00ean l\u00fd<\/strong>: m\u1ed9t <a href=\"https:\/\/kiencang.net\/cau-truc-website\/\" target=\"_blank\" rel=\"noreferrer noopener\">c\u1ea5u tr\u00fac website t\u1ed1t<\/a> s\u1ebd khu\u1ebfch \u0111\u1ea1i hi\u1ec7u \u1ee9ng c\u1ee7a b\u1ea5t k\u1ef3 \u0111\u00f3ng g\u00f3p PR n\u00e0o<\/li><\/ul>\n\n\n\n<p><strong>V\u00ed d\u1ee5 9<\/strong><\/p>\n\n\n\n<p>V\u00f2ng l\u1eb7p tr\u00f2n &#8211; nh\u01b0ng c\u00f3 m\u1ed9t li\u00ean k\u1ebft tr\u1ecf \u0111\u1ebfn v\u00e0 m\u1ed9t li\u00ean k\u1ebft tr\u1ecf \u0111i<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"489\" height=\"177\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/08\/vidu9-pagerank.gif\" alt=\"v\u00ed d\u1ee5 9 v\u1ec1 pagerank\" class=\"wp-image-12720\"\/><\/figure><\/div>\n\n\n<p>V\u00e2ng, PR c\u1ee7a trang ch\u1ee7 \u0111\u00e3 t\u0103ng l\u00ean m\u1ed9t ch\u00fat, nh\u01b0ng \u0111i\u1ec1u g\u00ec \u0111\u00e3 x\u1ea3y ra v\u1edbi trang &#8220;More&#8221;?<\/p>\n\n\n\n<p>Phi\u1ebfu b\u1ea7u c\u1ee7a trang &#8220;Product&#8221; \u0111\u01b0\u1ee3c chia s\u1ebb nh\u01b0 nhau gi\u1eefa trang &#8220;More&#8221; v\u00e0 web b\u00ean ngo\u00e0i (website B). Ch\u00fang ta gi\u1edd xem gi\u00e1 tr\u1ecb c\u1ee7a site B b\u1eb1ng v\u1edbi trang &#8220;More&#8221;. Trang &#8220;More&#8221; ch\u1ec9 nh\u1eadn \u0111\u01b0\u1ee3c m\u1ed9t n\u1eeda phi\u1ebfu b\u1ea7u so v\u1edbi tr\u01b0\u1edbc \u0111\u00e2y &#8211; \u0111i\u1ec1u n\u00e0y l\u00e0 t\u1ed1t cho Site B nh\u01b0ng l\u1ea1i r\u1ea5t t\u1ec7 cho ch\u00fang ta!<\/p>\n\n\n\n<p><strong>V\u00ed d\u1ee5 10<\/strong><\/p>\n\n\n\n<p>Li\u00ean k\u1ebft d\u00e0y \u0111\u1eb7c d\u1ea1ng m\u1ea1ng l\u01b0\u1edbi (fully meshed) &#8211; nh\u01b0ng c\u00f3 m\u1ed9t li\u00ean k\u1ebft tr\u1ecf \u0111\u1ebfn v\u00e0 m\u1ed9t li\u00ean k\u1ebft tr\u1ecf \u0111i<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"489\" height=\"177\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/08\/vidu10-pagerank.gif\" alt=\"v\u00ed d\u1ee5 10 v\u1ec1 pagerank\" class=\"wp-image-12725\"\/><\/figure><\/div>\n\n\n<p>N\u00f3 \u0111\u00e3 t\u1ed1t h\u01a1n r\u1ea5t nhi\u1ec1u. Trang &#8220;More&#8221; v\u1eabn nh\u1eadn \u0111\u01b0\u1ee3c \u00edt phi\u1ebfu b\u1ea7u chia s\u1ebb nh\u1ea5t, tuy nhi\u00ean gi\u1edd trang &#8220;Product&#8221; \u0111\u00e3 gi\u1eef \u0111\u01b0\u1ee3c ba ph\u1ea7n t\u01b0 gi\u00e1 tr\u1ecb phi\u1ebfu b\u1ea7u c\u1ee7a n\u00f3 &#8211; kh\u00f4ng gi\u1ed1ng nh\u01b0 v\u00ed d\u1ee5 9 khi n\u00f3 cho \u0111i m\u1ed9t n\u1eeda phi\u1ebfu b\u1ea7u c\u1ee7a n\u00f3 cho trang b\u00ean ngo\u00e0i!<\/p>\n\n\n\n<ul><li><strong>\u0110i\u1ec1u quan s\u00e1t \u0111\u01b0\u1ee3c<\/strong>: gia t\u0103ng li\u00ean k\u1ebft n\u1ed9i b\u1ed9 trong trang c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 l\u00e0m t\u1ed1i thi\u1ec3u h\u00f3a t\u1ed5n h\u1ea1i \u0111\u1ebfn PR c\u1ee7a b\u1ea1n khi b\u1ea1n cho t\u1eb7ng phi\u1ebfu b\u1ea7u b\u1eb1ng c\u00e1ch li\u00ean k\u1ebft \u0111\u1ebfn c\u00e1c website b\u00ean ngo\u00e0i.<\/li><li><strong>Nguy\u00ean l\u00fd<\/strong>: (I) N\u1ebfu m\u1ed9t trang c\u1ee5 th\u1ec3 n\u00e0o \u0111\u1ea5y c\u00f3 m\u1ee9c \u0111\u1ed9 quan tr\u1ecdng cao &#8211; s\u1eed d\u1ee5ng c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p v\u1edbi trang quan tr\u1ecdng n\u1eb1m \u1edf \u0111\u1ec9nh (gi\u1ed1ng v\u1edbi v\u00ed d\u1ee5 5). (II) Khi m\u1ed9t nh\u00f3m c\u00e1c trang c\u00f3 th\u1ec3 bao g\u1ed3m c\u00e1c li\u00ean k\u1ebft ra b\u00ean ngo\u00e0i &#8211; l\u00e0m t\u0103ng s\u1ed1 l\u01b0\u1ee3ng li\u00ean k\u1ebft n\u1ed9i b\u1ed9 \u0111\u1ec3 gi\u1eef l\u1ea1i nhi\u1ec1u PR nh\u1ea5t c\u00f3 th\u1ec3. (III) Khi m\u1ed9t nh\u00f3m c\u00e1c trang kh\u00f4ng bao g\u1ed3m c\u00e1c li\u00ean k\u1ebft ra b\u00ean ngo\u00e0i &#8211; s\u1ed1 l\u01b0\u1ee3ng c\u00e1c li\u00ean k\u1ebft n\u1ed9i b\u1ed9 trong website <strong>kh\u00f4ng<\/strong> \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn PR trung b\u00ecnh c\u1ee7a website. B\u1ea1n c\u0169ng c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng m\u1ed9t c\u1ea5u tr\u00fac li\u00ean k\u1ebft \u0111\u1ec3 \u0111em l\u1ea1i tr\u1ea3i nghi\u1ec7m t\u1ed1t nh\u1ea5t cho ng\u01b0\u1eddi d\u00f9ng khi h\u1ecd th\u1ef1c hi\u1ec7n \u0111i\u1ec1u h\u01b0\u1edbng.<\/li><\/ul>\n\n\n\n<p><strong>Site maps<\/strong><\/p>\n\n\n\n<p>Site maps h\u1eefu d\u1ee5ng theo \u00edt nh\u1ea5t hai c\u00e1ch:<\/p>\n\n\n\n<ul><li>N\u1ebfu ng\u01b0\u1eddi d\u00f9ng g\u00f5 URL sai, h\u1ea7u h\u1ebft c\u00e1c website tr\u1ea3 v\u1ec1 k\u1ebft qu\u1ea3 kh\u00f4ng th\u1ef1c s\u1ef1 c\u00f3 \u00edch &#8211; &#8220;trang 404 &#8211; kh\u00f4ng t\u00ecm th\u1ea5y n\u1ed9i dung&#8221;.&nbsp; \u0110i\u1ec1u n\u00e0y l\u00e0m ng\u01b0\u1eddi d\u00f9ng ch\u00e1n n\u1ea3n. T\u1ea1i sao b\u1ea1n kh\u00f4ng \u0111i\u1ec1u ch\u1ec9nh m\u00e1y ch\u1ee7 \u0111\u1ec3 n\u00f3 tr\u1ea3 v\u1ec1 trang hi\u1ec3n th\u1ecb l\u1ed7i v\u1eeba t\u1ea1o, nh\u01b0ng k\u00e8m v\u1edbi \u0111\u00f3 l\u00e0 site map? \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 gi\u00fap \u0111\u1ee1 ng\u01b0\u1eddi d\u00f9ng r\u1ea5t nhi\u1ec1u<\/li><li>Li\u00ean k\u1ebft site map tr\u00ean m\u1ed7i trang l\u00e0m t\u0103ng s\u1ed1 l\u01b0\u1ee3ng li\u00ean k\u1ebft n\u1ed9i b\u1ed9 tr\u00ean trang, l\u00e0m gi\u1ea3m ph\u00e2n t\u00e1n PR ra ngo\u00e0i, v\u00e0 b\u1ea3o v\u1ec7 b\u1ea1n h\u1ea1n ch\u1ebf \u1ea3nh h\u01b0\u1edfng c\u1ee7a b\u1ea1n v\u1ec1 c\u00e1c phi\u1ebfu b\u1ea7u &#8220;thi\u1ec7n nguy\u1ec7n&#8221;<\/li><\/ul>\n\n\n\n<p><strong>V\u00ed d\u1ee5 11<\/strong><\/p>\n\n\n\n<p>Ch\u00fang ta th\u1eed s\u1eeda website c\u1ee7a ch\u00fang ta th\u00e0nh d\u1ea1ng t\u1eadp trung gi\u1ea3 PR v\u00e0o trang ch\u1ee7.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"302\" height=\"178\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/08\/vidu11-pagerank.gif\" alt=\"v\u00ed d\u1ee5 11 v\u1ec1 pagerank\" class=\"wp-image-12726\"\/><\/figure><\/div>\n\n\n<p>S\u01a1 \u0111\u1ed3 tr\u00f4ng kh\u00e1 \u1ed5n, h\u1ea7u h\u1ebft c\u00e1c li\u00ean k\u1ebft \u0111\u1ec1u tr\u1ecf t\u1edbi trang A, v\u00ec th\u1ebf n\u00f3 s\u1ebd nh\u1eadn \u0111\u01b0\u1ee3c ch\u1ec9 s\u1ed1 PR t\u1ed1t.<\/p>\n\n\n\n<p>H\u00e3y th\u1eed \u0111o\u00e1n gi\u00e1 tr\u1ecb PR c\u1ee7a trang A l\u00e0 bao nhi\u00eau tr\u01b0\u1edbc khi b\u1ea1n cu\u1ed9n chu\u1ed9t xu\u1ed1ng b\u00ean d\u01b0\u1edbi.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"302\" height=\"178\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/08\/ketqua-vidu11-pagerank.gif\" alt=\"k\u1ebft qu\u1ea3 v\u00ed d\u1ee5 11 v\u1ec1 pagerank\" class=\"wp-image-12727\"\/><\/figure><\/div>\n\n\n<p>B\u1ea1n th\u1ea5t \u0111\u1ea5y, n\u00f3 kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng t\u1ed1t l\u1eafm &#8211; t\u1ec7 h\u01a1n nhi\u1ec1u so v\u1edbi trang c\u1ea5u tr\u00fac th\u00f4ng th\u01b0\u1eddng (\u1edf v\u00ed d\u1ee5 5)! \u0110i\u1ec1u \u0111ang x\u1ea3y ra l\u00e0 trang C v\u00e0 D c\u00f3 c\u00e1c li\u00ean k\u1ebft tr\u1ecf \u0111\u1ebfn y\u1ebfu \u0111\u1ebfn m\u1ee9c m\u00e0 ch\u00fang kh\u00f4ng gi\u00fap \u0111\u01b0\u1ee3c g\u00ec nhi\u1ec1u cho trang A!<\/p>\n\n\n\n<ul><li><strong>Nguy\u00ean l\u00fd<\/strong>: c\u1ed1 g\u1eafng l\u1ea1m d\u1ee5ng ch\u1ec9 s\u1ed1 PR kh\u00f3 kh\u0103n h\u01a1n b\u1ea1n t\u01b0\u1edfng.<\/li><\/ul>\n\n\n\n<p><strong>V\u00ed d\u1ee5 12<\/strong><\/p>\n\n\n\n<p>M\u1ed9t thi\u1ebft k\u1ebf web ph\u1ed5 bi\u1ebfn cho c\u00e1c t\u00e0i li\u1ec7u d\u00e0i \u0111\u00f3 l\u00e0 ph\u00e2n chia t\u00e0i li\u1ec7u th\u00e0nh nhi\u1ec1u trang v\u1edbi li\u00ean k\u1ebft &#8220;Tr\u01b0\u1edbc&#8221; v\u00e0 &#8220;Sau&#8221; tr\u00ean m\u1ed7i trang k\u00e8m v\u1edbi li\u00ean k\u1ebft ng\u01b0\u1ee3c tr\u1edf v\u1ec1 trang ch\u1ee7. Trang ch\u1ee7 ch\u1ec9 c\u1ea7n tr\u1ecf \u0111\u1ebfn trang \u0111\u1ea7u ti\u00ean c\u1ee7a t\u00e0i li\u1ec7u.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"302\" height=\"178\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/08\/vidu12-pagerank.gif\" alt=\"v\u00ed d\u1ee5 12 v\u1ec1 pagerank\" class=\"wp-image-12723\"\/><\/figure><\/div>\n\n\n<p>Trong v\u00ed d\u1ee5 \u0111\u01a1n gi\u1ea3n n\u00e0y, khi ch\u1ec9 c\u00f3 m\u1ed9t t\u00e0i li\u1ec7u, trang \u0111\u1ea7u ti\u00ean c\u1ee7a t\u00e0i li\u1ec7u c\u00f3 PR h\u01a1n c\u1ea3 trang ch\u1ee7! \u0111i\u1ec1u n\u00e0y x\u1ea3y ra l\u00e0 v\u00ec trang B nh\u1eadn \u0111\u01b0\u1ee3c to\u00e0n b\u1ed9 phi\u1ebfu b\u1ea7u t\u1eeb trang A, nh\u01b0ng trang A ch\u1ec9 nh\u1eadn \u0111\u01b0\u1ee3c m\u1ed9t ph\u1ea7n phi\u1ebfu b\u1ea7u t\u1eeb trang B, C v\u00e0 D.<\/p>\n\n\n\n<ul><li><strong>Nguy\u00ean l\u00fd<\/strong>: \u0111\u1ec3 \u0111em l\u1ea1i cho ng\u01b0\u1eddi xem tr\u00ean trang c\u1ee7a b\u1ea1n tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng t\u1ed1t, b\u1ea1n c\u00f3 th\u1ec3 ph\u1ea3i ch\u1ed1ng l\u1ea1i \u00fd t\u01b0\u1edfng v\u1ec1 ki\u1ec3u PR n\u00e0o t\u1ed1t nh\u1ea5t b\u1ea1n n\u00ean c\u00f3. B\u1ea1n ch\u1eb3ng th\u1ec3 l\u00e0m \u0111i\u1ec1u g\u00ec \u1edf \u0111\u00e2y c\u1ea3 &#8211; v\u00e0 b\u1ea1n c\u0169ng kh\u00f4ng c\u1ea7n c\u1ed1 g\u1eafng ho\u1eb7c lo l\u1eafng v\u1ec1 \u0111i\u1ec1u \u0111\u00f3! N\u1ebfu trang c\u1ee7a b\u1ea1n \u0111em l\u1ea1i c\u1ea3m gi\u00e1c tho\u1ea3i m\u00e1i khi s\u1eed d\u1ee5ng, s\u1ebd c\u00f3 nhi\u1ec1u ch\u1ee7 trang c\u00f3 kh\u1ea3 n\u0103ng li\u00ean k\u1ebft \u0111\u1ebfn b\u1ea1n v\u00e0 b\u1ea1n s\u1ebd nh\u1eadn \u0111\u01b0\u1ee3c nhi\u1ec1u PR h\u01a1n so v\u1edbi nh\u1eefng g\u00ec b\u1ea1n m\u1ea5t.<\/li><\/ul>\n\n\n\n<p>B\u1ea1n c\u00f3 th\u1ea5y \u0111\u01b0\u1ee3c xu h\u01b0\u1edbng gi\u1eefa \u0111i\u1ec1u n\u00e0y v\u00e0 v\u00ed d\u1ee5 tr\u01b0\u1edbc \u0111\u00f3? Khi b\u1ea1n th\u00eam nhi\u1ec1u li\u00ean k\u1ebft n\u1ed9i b\u1ed9 v\u00e0o trang n\u00f3 s\u1ebd \u0111\u1ebfn g\u1ea7n tr\u1ea1ng th\u00e1i gi\u1ed1ng v\u1edbi v\u00ed d\u1ee5 7 v\u1ec1 li\u00ean k\u1ebft d\u00e0y \u0111\u1eb7c khi m\u00e0 t\u1ea5t c\u1ea3 c\u00e1c trang s\u1ebd nh\u1eadn gi\u00e1 tr\u1ecb PR trung b\u00ecnh.<\/p>\n\n\n\n<ul><li><strong>\u0110i\u1ec1u quan s\u00e1t \u0111\u01b0\u1ee3c<\/strong>: khi b\u1ea1n th\u00eam nhi\u1ec1u li\u00ean k\u1ebft n\u1ed9i b\u1ed9 v\u00e0o trang c\u1ee7a b\u1ea1n, PR s\u1ebd ph\u00e2n t\u00e1n ra \u0111\u1ed3ng \u0111\u1ec1u h\u01a1n (more evenly) gi\u1eefa c\u00e1c trang.<\/li><\/ul>\n\n\n\n<p><strong>V\u00ed d\u1ee5 13<\/strong><\/p>\n\n\n\n<p>Nh\u1eadn \u0111\u01b0\u1ee3c PR cao theo c\u00e1ch sai v\u00e0 theo c\u00e1ch \u0111\u00fang.<\/p>\n\n\n\n<p>\u0110\u00e2y ch\u1ec9 l\u00e0 gi\u1ea3 thuy\u1ebft th\u1eed nghi\u1ec7m, gi\u1ea3 d\u1ee5 ch\u00fang ta nh\u1eadn \u0111\u01b0\u1ee3c 1000 trang tr\u1ecf \u0111\u1ebfn trang ch\u1ee7 (trang A), nh\u01b0ng ch\u1ec9 c\u00f3 m\u1ed9t li\u00ean k\u1ebft tr\u1ecf ra b\u00ean ngo\u00e0i (\u0111\u1ebfn trang B)&#8230;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"511\" height=\"320\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/08\/vidu13-pagerank.gif\" alt=\"v\u00ed d\u1ee5 13 v\u1ec1 PageRank\" class=\"wp-image-12737\"\/><\/figure><\/div>\n\n\n<p>\u0110\u00fang v\u1eady, nh\u1eefng trang spam n\u00e0y kh\u00e1 v\u00f4 gi\u00e1 tr\u1ecb nh\u01b0ng ch\u00fang ch\u1eafc ch\u1eafn l\u00e0m \u0111\u1ea9y gi\u00e1 tr\u1ecb c\u1ee7a trang ch\u1ee7.<\/p>\n\n\n\n<ul><li><strong>\u0110i\u1ec1u quan s\u00e1t \u0111\u01b0\u1ee3c<\/strong>: kh\u00f4ng th\u00e0nh v\u1ea5n \u0111\u1ec1 l\u00e0 b\u1ea1n c\u00f3 bao nhi\u00eau trang tr\u00ean website, ch\u1ec9 s\u1ed1 PR trung b\u00ecnh c\u1ee7a b\u1ea1n lu\u00f4n l\u00e0 1,0. Nh\u01b0ng c\u1ea5u tr\u00fac layout c\u00f3 th\u1ec3 t\u1eadp trung m\u1ea1nh m\u1ebd v\u00e0o phi\u1ebfu b\u1ea7u, v\u00e0 do \u0111\u00f3 l\u00e0 v\u00e0o PR cho trang ch\u1ee7!<\/li><\/ul>\n\n\n\n<p>\u0110\u00e2y l\u00e0 k\u1ef9 thu\u1eadt \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng b\u1edfi m\u1ed9t s\u1ed1 trang g\u00e2y tranh c\u00e3i (h\u1ea7u h\u1ebft l\u00e0 c\u00e1c trang ng\u01b0\u1eddi l\u1edbn). Nh\u01b0ng t\u00f4i kh\u00f4ng th\u1ec3 khuy\u00ean b\u1ea1n l\u00e0m \u0111i\u1ec1u n\u00e0y &#8211; n\u1ebfu b\u1ecd t\u00ecm ki\u1ebfm c\u1ee7a Google bi\u1ebft b\u1ea1n l\u00e0m \u0111i\u1ec1u n\u00e0y v\u00ec m\u1ee5c \u0111\u00edch g\u00ec b\u1ea1n c\u00f3 kh\u1ea3 n\u0103ng b\u1ecb ph\u1ea1t (c\u1ea5m) b\u1edfi Google! \u0110i\u1ec1u n\u00e0y l\u00e0 th\u1ea3m h\u1ecda!<\/p>\n\n\n\n<p>M\u1eb7t kh\u00e1c, c\u00f3 \u00edt nh\u1ea5t hai c\u00e1ch h\u1ee3p l\u1ec7 \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c PR cao:<\/p>\n\n\n\n<p><strong>1. Tr\u1edf th\u00e0nh m\u1ed9t trang l\u1edbn<\/strong><\/p>\n\n\n\n<p>Trang l\u1edbn, nh\u01b0 trang https:\/\/news.bbc.co.uk\/ c\u00f3 h\u00e0ng ch\u1ee5c ho\u1eb7c h\u00e0ng tr\u0103m bi\u00ean t\u1eadp vi\u00ean vi\u1ebft n\u1ed9i dung m\u1edbi &#8211; t\u1ee9c l\u00e0 c\u00e1c trang m\u1edbi su\u1ed1t c\u1ea3 ng\u00e0y! M\u1ed7i m\u1ed9t trang trong s\u1ed1 ch\u00fang gi\u00e0u n\u1ed9i dung, c\u00f3 gi\u00e1 tr\u1ecb c\u00f3 li\u00ean k\u1ebft ng\u01b0\u1ee3c tr\u1edf l\u1ea1i trang cha ho\u1eb7c trang ch\u1ee7! \u0110\u1ea5y l\u00e0 l\u00fd do v\u00ec sao trang ch\u1ee7 c\u00f3 ch\u1ec9 s\u1ed1 PR l\u00e0 9\/10 v\u00e0 ch\u00fang ta b\u1ecb \u0111\u1ea9y xu\u1ed1ng th\u1ea5p h\u01a1n v\u00e0 th\u1ea5p h\u01a1n n\u1eefa khi \u0111em ra so s\u00e1nh&#8230;<\/p>\n\n\n\n<ul><li><strong>Nguy\u00ean l\u00fd<\/strong>: N\u1ed9i dung l\u00e0 Vua! M\u1ed9t s\u1ef1 th\u1ef1c l\u00e0 kh\u00f4ng g\u00ec c\u00f3 th\u1ec3 thay th\u1ebf \u0111\u01b0\u1ee3c vi\u1ec7c c\u00f3 nhi\u1ec1u n\u1ed9i dung t\u1ed1t&#8230;<\/li><\/ul>\n\n\n\n<p><strong>2. Cho \u0111i th\u1ee9 g\u00ec \u0111\u00f3 h\u1eefu \u00edch<\/strong><\/p>\n\n\n\n<p>Trang www.phpbb.com c\u00f3 \u0111i\u1ec3m s\u1ed1 PR l\u00e0 8\/10 (t\u1ea1i th\u1eddi \u0111i\u1ec3m b\u00e0i g\u1ed1c ti\u1ebfng Anh n\u00e0y \u0111ang vi\u1ebft) v\u00e0 h\u1ecd ch\u1eb3ng c\u00f3 nhi\u1ec1u ti\u1ec1n hay chi\u1ebfn d\u1ecbch marketing r\u1ea7m r\u1ed9 n\u00e0o \u0111\u1ee9ng \u0111\u1eb1ng sau c\u1ea3! L\u00e0m th\u1ebf n\u00e0o l\u1ea1i c\u00f3 th\u1ec3 nh\u01b0 th\u1ebf \u0111\u01b0\u1ee3c?<\/p>\n\n\n\n<p>\u0110i\u1ec1u m\u00e0 nh\u00f3m n\u00e0y \u0111\u00e3 l\u00e0m \u0111\u01b0\u1ee3c l\u00e0 vi\u1ebft ra \u0111\u01b0\u1ee3c m\u1ed9t h\u1ec7 th\u1ed1ng di\u1ec5n \u0111\u00e0n r\u1ea5t h\u1eefu \u00edch, v\u00e0 tr\u1edf n\u00ean ph\u1ed5 bi\u1ebfn tr\u00ean nhi\u1ec1u website. V\u00e0 \u1edf cu\u1ed1i m\u1ed7i trang, \u1edf m\u1ecdi phi\u00ean b\u1ea3n c\u00e0i \u0111\u1eb7t, trong d\u00f2ng m\u00e3 HTML \u0111\u1ec1u c\u00f3 d\u00f2ng sau:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><code>Powered by &lt;a href=\"https:\/\/www.phpbb.com\/\" target=\"_blank\">phpBB&lt;\/a><\/code><\/p>\n\n\n\n<p>Ng\u01b0\u1eddi qu\u1ea3n tr\u1ecb website v\u1eeba c\u00e0i \u0111\u1eb7t c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng lo\u1ea1i b\u1ecf \u0111\u01b0\u1eddng link \u0111\u00f3, nh\u01b0ng ph\u1ea7n l\u1edbn kh\u00f4ng l\u00e0m v\u1eady b\u1edfi v\u00ec h\u1ecd mu\u1ed1n \u0111\u1ec3 \u0111\u00f3 nh\u01b0 m\u1ed9t l\u1eddi c\u1ea3m \u01a1n&#8230;<\/p>\n\n\n\n<p>B\u1ea1n c\u00f3 th\u1ec3 t\u01b0\u1edfng t\u01b0\u1ee3ng c\u00f3 h\u00e0ng tri\u1ec7u trang \u1ee7ng h\u1ed9 phpbb.com? Wow!<\/p>\n\n\n\n<ul><li><strong>Nguy\u00ean l\u00fd<\/strong>: T\u1ea1o ra \u0111i\u1ec1u g\u00ec \u0111\u00f3 c\u00f3 gi\u00e1 tr\u1ecb, \u0111\u00f3 c\u00f3 th\u1ec3 l\u00e0 n\u1ed9i dung ho\u1eb7c c\u00f4ng c\u1ee5. N\u1ebfu m\u00f3n qu\u00e0 c\u1ee7a b\u1ea1n \u0111\u1ee7 h\u1ea5p d\u1eabn, ch\u1ee7 c\u00e1c trang kh\u00e1c s\u1ebd s\u1eb5n l\u00f2ng g\u1eedi t\u1eb7ng b\u1ea1n m\u1ed9t li\u00ean k\u1ebft ng\u01b0\u1ee3c.<\/li><li><strong>Nguy\u00ean l\u00fd<\/strong>: C\u00f3 l\u1ebd s\u1ebd t\u1ed1t h\u01a1n khi c\u00f3 \u0111\u01b0\u1ee3c nhi\u1ec1u (c\u00f3 th\u1ec3 l\u00e0 h\u00e0ng ng\u00e0n) li\u00ean k\u1ebft t\u1eeb c\u00e1c website c\u00f3 PR nh\u1ecf h\u01a1n l\u00e0 b\u1ecf th\u1eddi gian v\u00e0 ti\u1ec1n b\u1ea1c ch\u1ec9 \u0111\u1ec3 theo \u0111u\u1ed5i m\u00f2n m\u1ecfi m\u1ed9t li\u00ean k\u1ebft t\u1eeb trang c\u00f3 PR cao.<\/li><\/ul>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"7_Thao_luan_ve_gia_tri_trung_binh\"><\/span>#7. Th\u1ea3o lu\u1eadn v\u1ec1 gi\u00e1 tr\u1ecb trung b\u00ecnh<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>K\u1ec3 t\u1eeb khi Brin v\u00e0 Page \u0111\u01b0a ra ph\u00e1t minh c\u1ee7a h\u1ecd, gi\u00e1 tr\u1ecb trung b\u00ecnh PR th\u1ef1c s\u1ef1 c\u1ee7a t\u1ea5t c\u1ea3 c\u00e1c trang trong ch\u1ec9 m\u1ee5c v\u1eabn ch\u1ec9 l\u00e0 1,0!<\/p>\n\n\n\n<p>V\u00ec th\u1ebf n\u1ebfu b\u1ea1n th\u00eam c\u00e1c trang m\u1edbi v\u00e0o website, b\u1ea1n s\u1ebd th\u00eam v\u00e0o t\u1ed5ng s\u1ed1 PR m\u1ed7i trang l\u00e0 1,0 (nh\u01b0ng ch\u1ec9 khi b\u1ea1n li\u00ean k\u1ebft c\u00e1c trang v\u1edbi nhau, nh\u1edd th\u1ebf ch\u01b0\u01a1ng tr\u00ecnh m\u1edbi ho\u1ea1t \u0111\u1ed9ng \u0111\u01b0\u1ee3c), tuy nhi\u00ean gi\u00e1 tr\u1ecb trung b\u00ecnh th\u00ec v\u1eabn nguy\u00ean nh\u01b0 v\u1eady.<\/p>\n\n\n\n<p>N\u1ebfu b\u1ea1n mu\u1ed1n t\u1eadp trung PR v\u00e0o m\u1ed9t ho\u1eb7c v\u00e0i trang, c\u00e1c trang c\u1ea5u tr\u00fac theo ki\u1ec3u th\u1ee9 b\u1eadc (hierarchical) s\u1ebd l\u00e0m \u0111\u01b0\u1ee3c \u0111i\u1ec1u \u0111\u00f3. N\u1ebfu b\u1ea1n mu\u1ed1n ph\u00e2n t\u00e1n \u0111\u1ec1u PR gi\u1eefa c\u00e1c trang h\u00e3y li\u00ean k\u1ebft trang theo ki\u1ec3u m\u1ea1ng l\u01b0\u1edbi d\u00e0y \u0111\u1eb7c (fully meshing) &#8211; l\u00e0 c\u00e1c v\u00ed d\u1ee5 5, 6 v\u00e0 7 \u1edf tr\u00ean. (Ghi ch\u00fa, \u0111\u00e2y l\u00e0 \u0111i\u1ec1u m\u00e0 Riding \u0111\u00e3 sai, trong m\u00f4 h\u00ecnh MiniRank c\u00faa anh \u1ea5y, v\u00f2ng l\u1eb7p ph\u1ea3n h\u1ed3i s\u1ebd l\u00e0m t\u0103ng PR &#8211; kh\u00f4ng c\u00f3 gi\u1edbi h\u1ea1n!)<\/p>\n\n\n\n<p>C\u00f3 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft t\u1eeb website b\u00ean ngo\u00e0i tr\u1ecf \u0111\u1ebfn (inbound links) l\u00e0 c\u00e1ch duy nh\u1ea5t \u0111\u1ec3 l\u00e0m t\u0103ng gi\u00e1 tr\u1ecb PR trung b\u00ecnh c\u1ee7a b\u1ea1n. C\u00e1ch PR ph\u00e2n ph\u1ed1i b\u00ean trong c\u00e1c trang c\u1ee7a b\u1ea1n c\u1ee5 th\u1ec3 ra sao c\u00f2n ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c li\u00ean k\u1ebft n\u1ed9i b\u1ed9 c\u1ee7a b\u1ea1n nh\u01b0 th\u1ebf n\u00e0o, v\u00e0 trang n\u00e0o c\u1ee7a b\u1ea1n \u0111\u01b0\u1ee3c tr\u1ecf \u0111\u1ebfn.<\/p>\n\n\n\n<p>N\u1ebfu b\u1ea1n c\u00f3 li\u00ean k\u1ebft tr\u1ecf ra b\u00ean ngo\u00e0i website c\u1ee7a b\u1ea1n, th\u00ec PR trung b\u00ecnh c\u00e1c trang c\u1ee7a b\u1ea1n s\u1ebd gi\u1ea3m xu\u1ed1ng (b\u1ea1n \u0111\u00e3 kh\u00f4ng gi\u1eef c\u00e1c b\u1ea7u ch\u1ecdn \u1edf &#8220;trong nh\u00e0 m\u00ecnh&#8221;). M\u1ed9t l\u1ea7n n\u1eefa, vi\u1ec7c b\u1ecb gi\u1ea3m c\u1ee5 th\u1ec3 ra sao c\u00f2n ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c li\u00ean k\u1ebft c\u1ee5 th\u1ec3 th\u1ebf n\u00e0o.<\/p>\n\n\n\n<p>Ch\u00fang ta bi\u1ebft r\u1eb1ng PR trung b\u00ecnh c\u1ee7a t\u1ea5t c\u1ea3 c\u00e1c trang c\u00f3 gi\u00e1 tr\u1ecb l\u00e0 1,0. Trong khi ch\u00fang ta th\u1ea5y c\u00f3 m\u1ed9t s\u1ed1 trang c\u00f3 PageRank l\u00ean \u0111\u1ebfn h\u00e0ng tri\u1ec7u, do v\u1eady s\u1ebd ph\u1ea3i c\u00f3 r\u1ea5t r\u1ea5t nhi\u1ec1u trang c\u00f3 gi\u00e1 tr\u1ecb PR Th\u1ee9c T\u1ebf d\u01b0\u1edbi 1,0 (\u0111\u1eb7c bi\u1ec7t l\u00e0 do gi\u00e1 tr\u1ecb PR Th\u1ef1c T\u1ebf tuy\u1ec7t \u0111\u1ed1i lu\u00f4n c\u00f3 s\u1eb5n cho nh\u1eefng trang kh\u00f4ng c\u00f3 li\u00ean k\u1ebft tr\u1ecf \u0111\u1ebfn, t\u1ee9c l\u00e0 1 &#8211; d).<\/p>\n\n\n\n<p>\u0110i\u1ec1u \u0111\u00f3 c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn t\u00ecnh tr\u1ea1ng l\u00e0 tr\u00ean thanh c\u00f4ng c\u1ee5 PR c\u00f3 gi\u00e1 tr\u1ecb \u0111\u1ea1i di\u1ec7n 1,2 nh\u01b0ng gi\u00e1 tr\u1ecb PR th\u1ef1c t\u1ebf c\u1ee7a n\u00f3 c\u00f3 th\u1ec3 th\u1ea5p h\u01a1n 1,0! V\u00ed d\u1ee5 h\u00e0m log tr\u00ean thanh c\u00f4ng c\u1ee5 c\u00f3 th\u1ec3 l\u00e0 10, nh\u01b0ng gi\u00e1 tr\u1ecb th\u1ef1c t\u1ebf c\u1ee7a PR c\u00f3 th\u1ec3 b\u1eaft \u0111\u1ea7u v\u1edbi chu\u1ed7i kh\u00e1 th\u1ea5p nh\u01b0: 0,01; 0,1; 1; 10; 100; 1000, v\u00e2n v\u00e2n.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"8_Loi_cuoi\"><\/span>#8. L\u1eddi cu\u1ed1i<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Trong th\u1ef1c t\u1ebf th\u00ec PageRank r\u1ea5t \u0111\u01a1n gi\u1ea3n (kh\u00f4ng h\u1ec1 gi\u1ed1ng v\u1edbi c\u00f4ng th\u1ee9c \u0111\u00e1ng s\u1ee3 c\u1ee7a n\u00f3). Nh\u01b0ng khi m\u1ed9t c\u00f4ng th\u1ee9c \u0111\u01a1n gi\u1ea3n \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng h\u00e0ng tr\u0103m (ho\u1eb7c th\u1eadm ch\u00ed l\u00e0 h\u00e0ng tri\u1ec7u) l\u1ea7n l\u1eb7p l\u1ea1i \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 th\u00ec n\u00f3 <strong>c\u00f3 v\u1ebb<\/strong> ph\u1ee9c t\u1ea1p.<\/p>\n\n\n\n<p>PageRank c\u0169ng ch\u1ec9 l\u00e0 m\u1ed9t ph\u1ea7n trong c\u00e2u chuy\u1ec7n v\u1ec1: c\u00e1i g\u00ec th\u00ec c\u00f3 hi\u1ec7u qu\u1ea3 trong vi\u1ec7c gi\u00e0nh \u0111\u01b0\u1ee3c v\u1ecb tr\u00ed cao h\u01a1n trong k\u1ebft qu\u1ea3 tr\u1ea3 v\u1ec1 c\u1ee7a Google? L\u1ea5y v\u00ed d\u1ee5 c\u00f3 m\u1ed9t s\u1ed1 b\u1eb1ng ch\u1ee9ng cho th\u1ea5y Google \u0111ang ch\u00fa \u00fd r\u1ea5t nhi\u1ec1u v\u00e0o <a href=\"https:\/\/kiencang.net\/van-ban-neo\/\" target=\"_blank\" rel=\"noreferrer noopener\">v\u0103n b\u1ea3n neo<\/a> khi quy\u1ebft \u0111\u1ecbnh m\u1ee9c \u0111\u1ed9 li\u00ean quan c\u1ee7a trang \u0111\u01b0\u1ee3c tr\u1ecf \u0111\u1ebfn &#8211; c\u00f3 l\u1ebd c\u00f2n nhi\u1ec1u h\u01a1n so v\u1edbi PR c\u1ee7a trang&#8230;<\/p>\n\n\n\n<p>Tuy nhi\u00ean PageRank v\u1eabn l\u00e0 m\u1ed9t ph\u1ea7n trong thu\u1eadt to\u00e1n c\u1ee7a x\u1ebfp h\u1ea1ng c\u1ee7a Google, do n\u00f3 x\u1ee9ng \u0111\u00e1ng \u0111\u01b0\u1ee3c nh\u1eefng ng\u01b0\u1eddi thi\u1ebft k\u1ebf web gi\u1ecfi hi\u1ec3u \u0111\u00fang.<\/p>\n\n\n\n<p><em>(D\u1ecbch t\u1eeb b\u00e0i vi\u1ebft The Google Pagerank Algorithm and How It Works &#8211; t\u00e1c gi\u1ea3 Ian Rogers)<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>PageRank l\u00e0 ch\u1ee7 \u0111\u1ec1 \u0111\u01b0\u1ee3c th\u1ea3o lu\u1eadn r\u1ea5t nhi\u1ec1u trong c\u1ed9ng \u0111\u1ed3ng nh\u1eefng ng\u01b0\u1eddi l\u00e0m SEO chuy\u00ean nghi\u1ec7p (SEO experts). C\u1ed1t l\u00f5i c\u1ee7a PageRank l\u00e0 m\u1ed9t c\u00f4ng th\u1ee9c to\u00e1n h\u1ecdc (mathematical formula), m\u00e0 khi nh\u00ecn v\u00e0o, n\u00f3 d\u01b0\u1eddng nh\u01b0 l\u00e0m m\u1ecdi ng\u01b0\u1eddi s\u1ee3 h\u00e3i, nh\u01b0ng th\u1ef1c ra PageRank l\u1ea1i kh\u00e1 d\u1ec5 hi\u1ec3u. D\u00f9 v\u1eady, nhi\u1ec1u &hellip;<\/p>\n","protected":false},"author":1,"featured_media":12732,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[39],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>C\u00e1ch t\u00ednh PageRank - m\u00f3n \u0111\u1ed3 c\u1ed5 gi\u00e1 tr\u1ecb trong SEO &#8226; Ki\u1ebfn c\u00e0ng<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kiencang.net\/cach-tinh-pagarank\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C\u00e1ch t\u00ednh PageRank - m\u00f3n \u0111\u1ed3 c\u1ed5 gi\u00e1 tr\u1ecb trong SEO &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"PageRank l\u00e0 ch\u1ee7 \u0111\u1ec1 \u0111\u01b0\u1ee3c th\u1ea3o lu\u1eadn r\u1ea5t nhi\u1ec1u trong c\u1ed9ng \u0111\u1ed3ng nh\u1eefng ng\u01b0\u1eddi l\u00e0m SEO chuy\u00ean nghi\u1ec7p (SEO experts). C\u1ed1t l\u00f5i c\u1ee7a PageRank l\u00e0 m\u1ed9t c\u00f4ng th\u1ee9c to\u00e1n h\u1ecdc (mathematical formula), m\u00e0 khi nh\u00ecn v\u00e0o, n\u00f3 d\u01b0\u1eddng nh\u01b0 l\u00e0m m\u1ecdi ng\u01b0\u1eddi s\u1ee3 h\u00e3i, nh\u01b0ng th\u1ef1c ra PageRank l\u1ea1i kh\u00e1 d\u1ec5 hi\u1ec3u. D\u00f9 v\u1eady, nhi\u1ec1u &hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/kiencang.net\/cach-tinh-pagarank\/\" \/>\n<meta property=\"og:site_name\" content=\"Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/anhducnguyen87\/\" \/>\n<meta property=\"article:published_time\" content=\"2021-08-26T01:15:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-09-01T04:32:31+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/08\/cach-tinh-pagerank.png\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"500\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Nguy\u1ec5n \u0110\u1ee9c Anh\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi\" \/>\n\t<meta name=\"twitter:data1\" content=\"Nguy\u1ec5n \u0110\u1ee9c Anh\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc\" \/>\n\t<meta name=\"twitter:data2\" content=\"29 ph\u00fat\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"C\u00e1ch t\u00ednh PageRank - m\u00f3n \u0111\u1ed3 c\u1ed5 gi\u00e1 tr\u1ecb trong SEO &#8226; Ki\u1ebfn c\u00e0ng","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/kiencang.net\/cach-tinh-pagarank\/","og_locale":"vi_VN","og_type":"article","og_title":"C\u00e1ch t\u00ednh PageRank - m\u00f3n \u0111\u1ed3 c\u1ed5 gi\u00e1 tr\u1ecb trong SEO &#8226; Ki\u1ebfn c\u00e0ng","og_description":"PageRank l\u00e0 ch\u1ee7 \u0111\u1ec1 \u0111\u01b0\u1ee3c th\u1ea3o lu\u1eadn r\u1ea5t nhi\u1ec1u trong c\u1ed9ng \u0111\u1ed3ng nh\u1eefng ng\u01b0\u1eddi l\u00e0m SEO chuy\u00ean nghi\u1ec7p (SEO experts). C\u1ed1t l\u00f5i c\u1ee7a PageRank l\u00e0 m\u1ed9t c\u00f4ng th\u1ee9c to\u00e1n h\u1ecdc (mathematical formula), m\u00e0 khi nh\u00ecn v\u00e0o, n\u00f3 d\u01b0\u1eddng nh\u01b0 l\u00e0m m\u1ecdi ng\u01b0\u1eddi s\u1ee3 h\u00e3i, nh\u01b0ng th\u1ef1c ra PageRank l\u1ea1i kh\u00e1 d\u1ec5 hi\u1ec3u. 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Email li\u00ean h\u1ec7: guiemailchotoi@gmail.com","sameAs":["https:\/\/www.facebook.com\/anhducnguyen87\/"],"url":"https:\/\/kiencang.net\/author\/admin\/"}]}},"_links":{"self":[{"href":"https:\/\/kiencang.net\/wp-json\/wp\/v2\/posts\/12699"}],"collection":[{"href":"https:\/\/kiencang.net\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kiencang.net\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kiencang.net\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kiencang.net\/wp-json\/wp\/v2\/comments?post=12699"}],"version-history":[{"count":1,"href":"https:\/\/kiencang.net\/wp-json\/wp\/v2\/posts\/12699\/revisions"}],"predecessor-version":[{"id":23228,"href":"https:\/\/kiencang.net\/wp-json\/wp\/v2\/posts\/12699\/revisions\/23228"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/kiencang.net\/wp-json\/wp\/v2\/media\/12732"}],"wp:attachment":[{"href":"https:\/\/kiencang.net\/wp-json\/wp\/v2\/media?parent=12699"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kiencang.net\/wp-json\/wp\/v2\/categories?post=12699"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kiencang.net\/wp-json\/wp\/v2\/tags?post=12699"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}