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Ranked retrieval

  • Thus far, our queries have all been Boolean.

    • Documents either match or don’t.

  • Good for expert users with precise understanding of their needs and the collection.

    • Also good for applications: Applications can easily consume 1000s of results.

  • Not good for the majority of users.

    • Most users incapable of writing Boolean queries (or they are, but they think it’s too much work).

    • Most users don’t want to wade through 1000s of results.

      • This is particularly true of web search.


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