‘Algorithms’ Category Archive

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Excerpt: Introduction The PageRank algorithm is a global ranking metric used to determine the overall quality of a page. The Hilltop algorithm determines the quality of a result based on the relevance to the query term. The original paper is available. The algorithm overcomes problems with broad search terms which return large sets of documents that have to be ranked by checking them against expert sites are derived from the terms in the query. An expert site is be one which has many one-way links to other expert sites. Affiliated sites are discounted. (Sites are deemed affiliated if they share the…

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Excerpt: Introduction If you are serious about SEO, then it is important to know how different search engine algorithms work. In this post we look at the Hypertext-Induced Topic Selection (HITS) invented by Jon Kleinburg, 1998 [1]. It also goes under the name of the CLEVER (Clientside EigenVector Enhanced Retrieval) algorithm as implemented in a prototype IBM search engine. It is thought that search engine Teoma,  latter acquired by Ask, used a method based on the HITs algorithm. HITS is query dependent and calculated at the time of the search. Pages are given two scores, a hub-score which refers to the number of…

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Excerpt: TrustRank Algorithm TrustRank is an algorithm that was published in 2004 as a way of combating spam sites from achieving higher rankings than they deserve. It does this using the assumption that good websites rarely link to bad ones. For it to work it needs an initial selection of good website which are determined by humans and the level of trust is damped as the distance between links from the good site increases. Given that a patent has been filed it is possible that Yahoo have applied the algorithm to their search engine technology. However the idea that Google has a similar TrustRank…

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Excerpt: Topic Sensitive Search It used to be so simple. Make good titles, meta information, optimise your content, check the document outline build as many good quality links as you can. As more people become aware of the importance of Search Engine Optimisation (SEO),  it is becoming more difficult and it could be about to get even worse with the idea of topic sensitive searches and personalised search results. Does this mean the end of traditional SEO? Can a strategy be developed to ensure your site still stays at the top of the TS-SERPs. (Topic Sensitive-SERPs) pages. How does it Work? One published algorithm…