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Example
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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