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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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