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Link matrices and probabilities

  • Prior doc probability P(d) = 1/n

  • P(r|d)

    • within-document term frequency

    • tf x idf - based

  • P(c|r)

    • 1-to-1

    • thesaurus

  • P(q|c): canonical forms of query operators

    • Always use things like AND and NOT – never store a full CPT*

  • *conditional probability table

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