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  • Document collection (2 documents)

    • d1: Xerox reports a profit but revenue is down

    • d2: Lucent narrows quarter loss but revenue decreases further

  • Model: MLE unigram from documents; l = ½

  • Query: revenue down

    • P(Q|d1) = [(1/8 + 2/16)/2] x [(1/8 + 1/16)/2]

    • = 1/8 x 3/32 = 3/256

    • P(Q|d2) = [(1/8 + 2/16)/2] x [(0 + 1/16)/2]

    • = 1/8 x 1/32 = 1/256

  • Ranking: d1 > d2


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