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any given document whether it is relevant or non relevant
...PQ relevance document where the Q is meant to emphasise that it is for a specific query
...P relevance document
...Let us now assume following Robertson [7]that:1 The relevance of a document to a request is independent of other documents in the collection
...With this assumption we can now state a principle,in terms of probability of relevance,which shows that probabilistic information can be used in an optimal manner in retrieval
...The probability ranking principle
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