And gives too few or gives too many introducon to

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Unformatted text preview: oNen result in either too few (≈0) or too many (1000s) results. §༊  Query 1: “standard user dlink 650” → 200,000 hits §༊  Query 2: “standard user dlink 650 no card found” → 0 hits §༊  It takes a lot of skill to come up with a query that produces a manageable number of hits. §༊  AND gives too few; OR gives too many Introduc)on to Informa)on Retrieval Ranked retrieval models §༊  Rather than a set of documents sa*sfying a query expression, in ranked retrieval models, the system returns an ordering over the (top) documents in the collec*on with respect to a query §༊  Free text queries: Rather than a query language of operators and expressions, the user’s query is just one or more words in a human language...
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This document was uploaded on 02/14/2014.

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