; 198. This usually precedes a ranking drop, although not 100% of the time. Dwell Time: Google pays very close attention to “dwell time“: how long people spend on your page when coming from a Google search. [23], The name "PageRank" plays on the name of developer Larry Page, as well as of the concept of a web page. Redirection from one page to another, either via a HTTP 302 response or a "Refresh" meta tag, caused the source page to acquire the PageRank of the destination page. The formula uses a model of a random surfer who reaches their target site after several clicks, then switches to a random page. the PageRank value for a page u is dependent on the PageRank values for each page v contained in the set Bu (the set containing all pages linking to page u), divided by the number L(v) of links from page v. The PageRank theory holds that an imaginary surfer who is randomly clicking on links will eventually stop clicking. Country TLD of Referring Domain: Getting links from country-specific top level domain extensions (.de, .cn, .co.uk) may help you rank better in that country. 22. Backlink Age: According to a Google patent, older links have more ranking power than newly minted backlinks. 162. In both algorithms, each node processes and sends a number of bits per round that are polylogarithmic in n, the network size. denotes the degree of vertex is statistically close to the degree distribution of the graph 108. Indeed, one recent ranking factors industry study found that content length correlated with SERP position. Needless to say, Google doesn’t like sites that use Doorway Pages. Also, a recent study by SEMRush found a correlation between bounce rate and Google rankings. D What’s happening here? Ranking Through Links Based on the discussion ab o v e, w e giv e the follo wing in tuitiv e description of P ageRank: a page has high rank if the sum of the ranks of its bac klinks is high. D is the number of outbound links on page Content Hidden Behind Tabs: Do users need to click on a tab to reveal some of the content on your page? Hence PageRank Either way, it can hurt your site’s ranking. So Google may still use a variation of it. A 0.5 probability is commonly expressed as a "50% chance" of something happening. According to Google: .mw-parser-output .templatequote{overflow:hidden;margin:1em 0;padding:0 40px}.mw-parser-output .templatequote .templatequotecite{line-height:1.5em;text-align:left;padding-left:1.6em;margin-top:0}, PageRank works by counting the number and quality of links to a page to determine a rough estimate of how important the website is. 145. [67], PageRank has been used to rank spaces or streets to predict how many people (pedestrians or vehicles) come to the individual spaces or streets. 45. p ( This co v ers b oth the case when a page has man y bac klinks and when a page has a few highly rank ed bac klinks. Schema.org Usage: Pages that support microformats may rank above pages without it. YouTube: There’s no doubt that YouTube videos are given preferential treatment in the SERPs (probably because Google owns it ): In fact, Search Engine Land found that YouTube.com traffic increased significantly after Google Panda. Therefore, pages that cover every angle likely have an edge vs. pages that only cover a topic partially. 103. Domain History: A site with volatile ownership or several drops may tell Google to “reset” the site’s history, negating links pointing to the domain. 100. """PageRank: The trillion dollar algorithm. , It's even used for systems analysis of road networks, as well as biology, chemistry, neuroscience, and physics. Sarma et al. [5] Rajeev Motwani and Terry Winograd co-authored with Page and Brin the first paper about the project, describing PageRank and the initial prototype of the Google search engine, published in 1998. And I recently updated this entire list for 2021. ^ Links from .edu or .gov Domains: Matt Cutts has stated that TLD doesn’t factor into a site’s importance. 175. A page that is linked to by many pages with high PageRank receives a high rank itself. 123. 13. Linking Domain Age: Backlinks from aged domains may be more powerful than new domains. …Having whois privacy turned on isn’t automatically bad, but once you get several of these factors all together, you’re often talking about a very different type of webmaster than the fellow who just has a single site or so.”. Brand Name Anchor Text: Branded anchor text is a simple — but strong — brand signal. t A page that’s part of a closely related category may get a relevancy boost compared to a page that’s filed under an unrelated category. 95. Assume a small universe of four web pages: A, B, C, and D. Links from a page to itself are ignored. M [68][69] In lexical semantics it has been used to perform Word Sense Disambiguation,[70] Semantic similarity,[71] and also to automatically rank WordNet synsets according to how strongly they possess a given semantic property, such as positivity or negativity.[72]. Chrome Bookmarks: We know that Google collects Chrome browser usage data. Google wants to improve users’ experience of the web, and fast-loading web pages will do that. Keyword Prominence: Having a keyword appear in the first 100 words of a page’s content is correlated to first page Google rankings. (i.e., in the steady state), the equation (1) reads. {\displaystyle Q=\{q1,q2,\cdots \}} For example, if you have a page about cars that links to movie-related pages, this may tell Google that your page is about the movie Cars, not the automobile. has columns with only zero values, they should be replaced with the initial probability vector Relevancy is determined by hundreds of factors, and we always work on improving our algorithm. 19. 169. ranking of nodes (pages) in the adjacency matrix. forum profiles, blog comments) may be a sign of webspam. denotes the adjacency matrix of the graph and 12. = 157. That said, internal links likely have much less weight than anchor text coming from external sites. Google likely uses a sophisticated version of TF-IDF. Unnatural Link Spike: A 2013 Google Patent describes how Google can identify whether or not an influx of links to a page is legitimate. Google+ Circles: Even though Google+ is soon to be dead, Google still shows higher results for authors and sites that you’ve added to your Google Plus Circles. 10. Thus this is a variant of the eigenvector centrality measure used commonly in network analysis. """PageRank algorithm with explicit number of iterations. But going overboard can hurt you. 153. Number of Comments: Pages with lots of comments may be a signal of user-interaction and quality. 179. Google Sandbox: New sites that get a sudden influx of links are sometimes put in the Google Sandbox, which temporarily limits search visibility. [42] The PageRank of the HomePage of a website is the best indication Google offers for website authority. R PageRank is a way of measuring the importance of website pages. ‖ They may also help improve your site’s E-A-T. 79. {\displaystyle Y={1 \over N}\mathbf {1} } i It is assumed in several research papers that the distribution is evenly divided among all documents in the collection at the beginning of the computational process. A Google rep recently called this a “a very small ranking factor“. is the column vector of length 1 O 136. t LSI Keywords in Title and Description Tags: As with webpage content, LSI keywords in page meta tags probably help Google discern between words with multiple potential meanings. I tested ranking based solely on the view-to-subscriber ratio (ie. Multiple outbound links from one page to another page are treated as a single link. You want the answer, not billions of webpages, so Google's ranking systems use a search algorithm to give you useful and relevant Google search results in a fraction of a second. Syndicated Content: Is the content on the page original? Y 44. 1 Keyword in Subdomain: Moz’s expert panel agrees that a keyword appearing in the subdomain can boost rankings. In fact, one Googler said comments can help “a lot” with rankings. 110. 68. 199. HTML errors/W3C validation: Lots of HTML errors or sloppy coding may be a sign of a poor quality site. Keyword in H2, H3 Tags: Having your keyword appear as a subheading in H2 or H3 format may be another weak relevancy signal. Increasingly, Instagram wants people to spend time on the app because we enjoy it in a meaningful way, not just because we can’t stop scrolling. The computation ends when for some small In information retrieval, Okapi BM25 (BM is an abbreviation of best matching) is a ranking function used by search engines to estimate the relevance of documents to a given search query. Broken Links: Having too many broken links on a page may be a sign of a neglected or abandoned site. . {\displaystyle t=0} a vector of ranks such that v_i is the i-th rank from [0, 1], CS1 maint: multiple names: authors list (. 5. The Explore page algorithm is essentially trying to serve people the best, relevant content. , and normalized such that, for each j. i.e. is defined as. If you do Facebook marketing, one thing that you might want to understand is the Facebook algorithm.. In the current case. only give the same PageRank if their results are normalized: A typical example is using Scala's functional programming with Apache Spark RDDs to iteratively compute Page Ranks. But it’s not that important. 98. [26][27], PageRank was influenced by citation analysis, early developed by Eugene Garfield in the 1950s at the University of Pennsylvania, and by Hyper Search, developed by Massimo Marchiori at the University of Padua. {\displaystyle N} [6], Other link-based ranking algorithms for Web pages include the HITS algorithm invented by Jon Kleinberg (used by Teoma and now Ask.com), the IBM CLEVER project, the TrustRank algorithm and the Hummingbird algorithm. If so, Google has said that this content “may not be indexed”. L More complex variants can be built on top of SD2, such as adding specialist proxies and direct votes for specific issues, but SD2 as the underlying umbrella system, mandates that generalist proxies should always be used. 87. p ≤ This includes: keyword stuffing, header tag stuffing, excessive keyword decoration. {\displaystyle t^{-1}} 102. Google’s official word on the matter is: Which suggests that they do… at least in certain cases. p Y {\displaystyle E} 49. A hyperlink to a page counts as a vote of support. One of the most known and influential algorithms for computing the relevance of web pages is the Page Rank algorithm used by the Google search engine. October 18, 2013 at 7:36 PM # of Links from Separate C-Class IPs: Links from separate class-c IP addresses suggest a wider breadth of sites linking to you, which can help with rankings. Obviously, anchor text is less important than before (and, when over-optimized, work as a webspam signal). Excess PageRank Sculpting: Going too far with PageRank sculpting — by nofollowing all outbound links — may be a sign of gaming the system. Excessive 301 Redirects to Page: Backlinks coming from 301 redirects dilute some PageRank, according to a Webmaster Help Video. Manual Actions: There are several types of these, but most are related to black hat link building. Number of Internal Links Pointing to Page: The number of internal links to a page indicates its importance relative to other pages on the site (more internal links=more important). Results that people Pogostick from may get a significantly rankings drop. In sport the PageRank algorithm has been used to rank the performance of: teams in the National Football League (NFL) in the USA;[65] individual soccer players;[66] and athletes in the Diamond League. FREE TOOL TO CHECK GOOGLE PAGE RANK, DOMAIN AUTHORITY, GLOBAL RANK, LINKS AND MORE! {\displaystyle \mathbf {E} \mathbf {R} =\mathbf {1} } These strategies have severely impacted the reliability of the PageRank concept,[citation needed] which purports to determine which documents are actually highly valued by the Web community. Numerous academic papers concerning PageRank have been published since Page and Brin's original paper. {\displaystyle \epsilon }, —For Repeat Traffic: Sites with repeat visitors may get a Google ranking boost. may carry the penalty over to the new owner, content length correlated with SERP position, LSI keywords help search engines extract meaning, the mobile version of the Google News Carousel, is correlated to first page Google rankings, now-public Google Rater Guidelines Document, may distinguish between “quality” and “useful” content, helps Google thematically organize your content, YouTube.com traffic increased significantly after Google Panda, helps tell Google what that page is about, influence search results for later searches, likely looks at non-hyperlinked brand mentions, can increase the odds of a manual penalty. The PageRank of an undirected graph ⁡ Temporary Link Schemes: Google has caught onto people that create — and quickly remove — spammy links. Use of AMP: While not a direct Google ranking factor, AMP may be a requirement to rank in the mobile version of the Google News Carousel. A 0-10 approximation of PageRank called "Toolbar Pagerank" was once available for the verified site maintainers through the Google Webmaster Tools interface. Links From Ads: According to Google, links from ads should be nofollowed. Google had declared their intention to remove the PageRank score from the Google toolbar several months earlier. “YMYL” Keywords: Google has higher content quality standards for “Your Money or Your Life” keywords. D N The more often that word appears on a page, the more likely it is that the page is about that word. For example, one industry study found a correlation between multimedia and rankings: 46. However, I did notice a problem: For videos with really small subscriber counts, the score would get heavily amplified and surface to the top. Or, in certain cases, a penalized domain may carry the penalty over to the new owner. Latent Semantic Indexing Keywords in Content (LSI): LSI keywords help search engines extract meaning from words that have more than one meaning (for example: Apple the computer company vs. Apple the fruit). Tip: There's no way to request or pay for a better local ranking on Google. M < Quality of Linking Content: Links from poorly written or spun content don’t pass as much value as links from well-written, content. . A generalization of PageRank for the case of ranking two interacting groups of objects was described by Daugulis. 17. 20. In neuroscience, the PageRank of a neuron in a neural network has been found to correlate with its relative firing rate. ‖ PageRank (PR) is an algorithm used by Google Search to rank web pages in their search engine results. 51. [77], Even though "Toolbar" PageRank is less important for SEO purposes, the existence of back-links from more popular websites continues to push a webpage higher up in search rankings. Brand Mentions on Top Stories: Really big brands get mentioned on Top Stories sites all the time. 156. The change for non-AMP content to become eligible to appear in the mobile Top Stories feature in Search will also roll out in May 2021. They possess a higher potential to attract a user's attention as their location increases the attention economy attached to the site. Hence, a new page with PR 0 and no incoming links could have acquired PR 10 by redirecting to the Google home page. 117. ( To summarize, here are the most important Google ranking factors in 2021: Which SEO ranking factor from this list was new to you? 73. User Generated Content Links: Google can identify UGC vs. content published by the actual site owner. 134. Google advises webmasters to use the nofollow HTML attribute value on sponsored links. According to Search Engine Land, Fred “targets low-value content sites that put revenue above helping their users.”. This method of avoidance, however, also has various drawbacks, such as reducing the link value of legitimate comments. In fact, Google now penalizes websites that aren’t mobile friendly. R 39. Many believe that its main purpose is to measure how users interact with the search results (and rank the results accordingly). [35]. Authority of Linking Domain: The referring domain’s authority may play an independent role in a link’s value. 164. − The Google Rater Guidelines Document uses broken links as one was to assess a homepage’s quality. For search engine optimization purposes, some companies offer to sell high PageRank links to webmasters. j 70. = User Browsing History: You’ve probably noticed this yourself: websites that you visit frequently get a SERP boost for your searches. The PageRank computations require several passes, called "iterations", through the collection to adjust approximate PageRank values to more closely reflect the theoretical true value. 77. , i However, Google recently stated that HTML sitemaps aren’t “useful” for SEO. Private WhoIs: Private WhoIs information may be a sign of “something to hide”. Selling Links: Getting caught selling links can hurt your search visibility. 186. 1 [15] He later used it when he founded Baidu in China in 2000. In PageRank terms, academic departments link to each other by hiring their faculty from each other (and from themselves).[56]. And Google has said they “ignore” lots of Edu links. P So, the equation is as follows: where 6. 30. ) In other words, to be fair with pages that are not sinks, these random transitions are added to all nodes in the Web. {\displaystyle {\mathcal {M}}} 209. {\displaystyle p_{i}} [5] Shortly after, Page and Brin founded Google Inc., the company behind the Google search engine. The TrueSkill ranking system is a skill based ranking system for Xbox Live developed at Microsoft Research.The purpose of a ranking system is to both identify and track the skills of gamers in a game (mode) in order to be able to match them into competitive matches. p [81], Generalization of PageRank and eigenvector centrality for ranking objects of two kinds, Distributed algorithm for PageRank computation, % Parameter M adjacency matrix where M_i,j represents the link from 'j' to 'i', such that for all 'j', % Parameter v_quadratic_error quadratic error for v, % Return v, a vector of ranks such that v_i is the i-th rank from [0, 1], % N is equal to either dimension of M and the number of documents. ‖ According to Google: PageRank works by counting the number and quality of links to a page to determine a rough estimate of how important the website is. If the matrix is a transition probability, i.e., column-stochastic and M. T. Pilehvar, D. Jurgens and R. Navigli. Reciprocal Links: Google’s Link Schemes page lists “Excessive link exchanging” as a link scheme to avoid. The visible page rank is updated very infrequently. Especially important for geo-specific searches. Transactional Searches: Google sometimes displays different results for shopping-related keywords, like flight searches. Google's founders, in their original paper,[28] reported that the PageRank algorithm for a network consisting of 322 million links (in-edges and out-edges) converges to within a tolerable limit in 52 iterations. If Google thinks you’re adding keywords to your title and description tags in an effort to game the algo, they may hit your site with a penalty. Contact Us Page: The aforementioned Google Quality Document states that they prefer sites with an “appropriate amount of contact information”. Backlink Anchor Text: As noted in this description of Google’s original algorithm: “First, anchors often provide more accurate descriptions of web pages than the pages themselves.”. Generally, a link embedded in a page’s content is more powerful than a link in the footer or sidebar area. 113. [7], The eigenvalue problem was suggested in 1976 by Gabriel Pinski and Francis Narin, who worked on scientometrics ranking scientific journals,[8] in 1977 by Thomas Saaty in his concept of Analytic Hierarchy Process which weighted alternative choices,[9] and in 1995 by Bradley Love and Steven Sloman as a cognitive model for concepts, the centrality algorithm. The longer time spent, the better. Human Editors: Although never confirmed, Google has filed a patent for a system that allows human editors to influence the SERPs. The mathematics of PageRank are entirely general and apply to any graph or network in any domain. Google algorithm updates 2020 in review: Core updates, passage indexing and page experience. M M This is also sometimes referred to as “long clicks vs short clicks”. Google Hummingbird: This “algorithm change” helped Google go beyond keywords. [39] One algorithm takes ; the elements of each column sum up to 1, so the matrix is a stochastic matrix (for more details see the computation section below). p 205. Site Usability: A site that’s difficult to use or to navigate can hurt rankings indirectly by reducing time on site, pages viewed and bounce rate (in other words, RankBrain ranking factors). Widget Links: Google frowns on links that are automatically generated when user embeds a “widget” on their site. {\displaystyle \ell (p_{i},p_{j})} Doorway Pages: Google wants the page you show to Google to be the page that user ultimately see. Google uses a combination of webpage and website authority to determine the overall authority of a webpage competing for a keyword. [34] Content Recency: Google Caffeine update favors recently published or updated content, especially for time-sensitive searches. Alt Tag (for Image Links): Alt text acts as anchor text for images. Meta Tag Spamming: Keyword stuffing can also happen in meta tags. TF-IDF: A fancy way of saying: “How often does a certain word appear in a document?”. ∞ Rel=Canonical: When used properly, use of this tag may prevent Google from penalizing your site for duplicate content. n Country TLD extension: Having a Country Code Top Level Domain (.cn, .pt, .ca) can help the site rank for that particular country… but it can limit the site’s ability to rank globally. UX Signals From Other Keywords Page Ranks For: If the page ranks for several other keywords, it may give Google an internal sign of quality. The university received 1.8 million shares of Google in exchange for use of the patent; it sold the shares in 2005 for $336 million. Parked Domains: A Google update in December of 2011 decreased search visibility of parked domains. 74. If they suspect that your site’s pumping out computer-generated content, it could result in a penalty or de-indexing. Use of Google Analytics and Google Search Console: Some think that having these two programs installed on your site can improve your page’s indexing. Google considers the user experience in choosing and ranking results, so be sure that your page loads fast and is mobile-friendly. 63. Easter Egg Results: Google has a dozen or so Easter Egg results. Penalized WhoIs Owner: If Google identifies a particular person as a spammer it makes sense that they would scrutinize other sites owned by that person. 11. [78], Google elaborated on the reasons for PageRank deprecation at Q&A #March and announced Links and Content as the Top Ranking Factors, RankBrain was announced as the #3 Ranking Factor in October 2015 so the Top 3 Factors are now confirmed officially by Google. Frequency of page updates also play a role in freshness. is the set of pages that link to In other words, they do use domain age. 112. −

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