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Probability Ranking Principle

  • Let x be a document in the collection.

  • Let R represent relevance of a document w.r.t. given (fixed) query and let NR represent non-relevance.       ⇐  R={0,1} vs. NR/R

  • Need to find p(R|x) - probability that a document is relevant.
  • p(x|R), p(x|NR) - probability that if a relevant (non-relevant) document is retrieved, it is x.


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