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- The ability of a search engine to list results that satisfy the query, usually measured in percentage. (if 20 of the 50 results match the query the precision is 40%) Search spam and the complexity of language challenge the precision of search engines.
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- The degree in which a search engine lists documents matching a query. The more matching documents that are listed, the higher the precision. For example, if a search engine lists 80 documents found to match a query but only 20 of them contain the search words, then the precision would be 25%.
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- IDF, Multi Dimensional Scaling, Recall, Singular Value Decomposition, Term Frequency, Term Vector Database