IR-part2

63 queries as vectors key idea 1 do the same for

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Unformatted text preview: nforma)on Retrieval Effect of idf on ranking §༊  Ques*on: Does idf have an effect on ranking for one- term queries, like §༊  iPhone 28 Introduc)on to Informa)on Retrieval Effect of idf on ranking §༊  Ques*on: Does idf have an effect on ranking for one- term queries, like §༊  iPhone §༊  idf has no effect on ranking one term queries §༊  idf affects the ranking of documents for queries with at least two terms §༊  For the query capricious person, idf weigh*ng makes occurrences of capricious count for much more in the final document ranking than occurrences of person. 29 Introduc)on to Informa)on Retrieval S ec. 6.2.1 Collec*on vs. Document frequency §༊  The collec*on frequency of t is the number of occurrences of t in t...
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