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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 x 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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