weighted search

(information science)A search based on frequencies of thesearch terms in the documents being searched. Weightedsearch is often used by search engines. It produces anumerical score for each possible document. A document'sscore depends on the frequency of each search term in thatdocument compared with the overall frequency of that term inthe entire corpus of documents. A common approach is calledtf.idf which stands for term frequency * inverse documentfrequency. Term frequency means "the more often a term occursin a document, the more important it is in describing thatdocument."http://ciir.cs.umass.edu/cmpsci646/ir4/tsld034.htm Inversedocument frequency means the more documents a term appears in,the less important the term is.

A simple weighted search is just a list of search terms,for example: car automobile

Weighted search is often contrasted with boolean search.It is possible to have a search that syntactically is aboolean search but which also does a weighted search.

See also query expansion.

For a detailed technical discussion see Chapter 5,"Search Strategies", in the reference below.

["Information Retrieval", C. J. van Rijsbergen,].

单词	weighted search
释义	weighted search weighted search (information science)A search based on frequencies of thesearch terms in the documents being searched. Weightedsearch is often used by search engines. It produces anumerical score for each possible document. A document'sscore depends on the frequency of each search term in thatdocument compared with the overall frequency of that term inthe entire corpus of documents. A common approach is calledtf.idf which stands for term frequency * inverse documentfrequency. Term frequency means "the more often a term occursin a document, the more important it is in describing thatdocument."http://ciir.cs.umass.edu/cmpsci646/ir4/tsld034.htm Inversedocument frequency means the more documents a term appears in,the less important the term is. A simple weighted search is just a list of search terms,for example: car automobile Weighted search is often contrasted with boolean search.It is possible to have a search that syntactically is aboolean search but which also does a weighted search. See also query expansion. For a detailed technical discussion see Chapter 5,"Search Strategies", in the reference below. ["Information Retrieval", C. J. van Rijsbergen,].
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