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Ranked retrieval models

  • Rather than a set of documents satisfying a query expression, in ranked retrieval, the system returns an ordering over the (top) documents in the collection for 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

  • In principle, there are two separate choices here, but in practice, ranked retrieval has normally been associated with free text queries and vice versa


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