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Probability Ranking Principle

  • How do we compute all those probabilities?

    • Do not know exact probabilities, have to use estimates

    • Binary Independence Retrieval (BIR) – which we discuss later today – is the simplest model

  • Questionable assumptions

    • “Relevance” of each document is independent of relevance of other documents.

      • Really, it’s bad to keep on returning duplicates

    • Boolean model of relevance

    • That one has a single step information need

      • Seeing a range of results might let user refine query

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