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In information retrieval, a measure of the effectiveness of a search, expressed as the ratio of the number of relevant records or documents retrieved in response to the query to the total number of relevant records or documents in the database; for example, in a database containing 100 records relevant to the topic "book history," a search retrieving 50 records, 25 of which are relevant to the topic, would have 25 percent recall (25/100). One of the main difficulties in using recall as a measure of search effectiveness is that it can be nearly impossible to determine the total number of relevant records in all but very small databases. Compare with precision. See also: fallout.


From ODLIS, Online Dictionary of Library and Information Science by Joan M. Reitz
http://lu.com/odlis/odlis_c.cfm


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dhayward
Latest page update: made by dhayward , Oct 17 2007, 5:26 PM EDT (about this update About This Update dhayward Edited by dhayward

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