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  2. Discounted cumulative gain - Wikipedia

    en.wikipedia.org/wiki/Discounted_cumulative_gain

    The nDCG values for all queries can be averaged to obtain a measure of the average performance of a search engine's ranking algorithm. Note that in a perfect ranking algorithm, the will be the same as the producing an nDCG of 1.0. All nDCG calculations are then relative values on the interval 0.0 to 1.0 and so are cross-query comparable.

  3. PageRank - Wikipedia

    en.wikipedia.org/wiki/PageRank

    A search engine called "RankDex" from IDD Information Services, designed by Robin Li in 1996, developed a strategy for site-scoring and page-ranking. [15] Li referred to his search mechanism as "link analysis," which involved ranking the popularity of a web site based on how many other sites had linked to it. [16] RankDex, the first search ...

  4. Ranking (information retrieval) - Wikipedia

    en.wikipedia.org/wiki/Ranking_(information...

    Ranking of query is one of the fundamental problems in information retrieval (IR), [1] the scientific/engineering discipline behind search engines. [2] Given a query q and a collection D of documents that match the query, the problem is to rank, that is, sort, the documents in D according to some criterion so that the "best" results appear early in the result list displayed to the user.

  5. TrustRank - Wikipedia

    en.wikipedia.org/wiki/TrustRank

    Many web spam pages are created only with the intention of misleading search engines. These pages, chiefly created for commercial reasons, use various techniques to achieve higher-than-deserved rankings in the search engines' result pages. While human experts can easily identify spam, search engines are still being improved daily in order to do ...

  6. Domain authority - Wikipedia

    en.wikipedia.org/wiki/Domain_authority

    The domain authority (also referred to as thought leadership) of a website describes its relevance for a specific subject area or industry.Domain Authority is a search engine ranking score developed by Moz. [1] This relevance has a direct impact on its ranking by search engines, trying to assess domain authority through automated analytic algorithms.

  7. AOL Search FAQs - AOL Help

    help.aol.com/articles/aol-search-faqs

    When seeking online information, many people turn to search engines like Google, Bing, Yahoo, or AOL Search. These search engines function as digital indexes, organizing available content by topic and sub-topic, much like an index in a book. Each search engine builds its index using distinct methods, typically beginning with an automated ...

  8. Google matrix - Wikipedia

    en.wikipedia.org/wiki/Google_matrix

    These probabilities ordered by their decreasing values give the PageRank vector with the PageRank used by Google search to rank webpages. Usually one has for the World Wide Web that P ∝ 1 / K β {\displaystyle P\propto 1/K^{\beta }} with β ≈ 0.9 {\displaystyle \beta \approx 0.9} .

  9. TIOBE index - Wikipedia

    en.wikipedia.org/wiki/TIOBE_index

    TIOBE index is sensitive to the ranking policy of the search engines on which it is based. For instance, in April 2004 Google performed a cleanup action to get rid of unfair attempts to promote the search rank. As a consequence, there was a large drop for languages such as Javascript and C++, yet these languages have stayed at the top of the ...