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Mixture model

  • P(w|d) = lPmle(w|Md) + (1 – l)Pmle(w|Mc)

  • Mixes the probability from the document with the general collection frequency of the word.

  • Correctly setting lis very important

  • A high value of lambda makes the search “conjunctive-like” – suitable for short queries

  • A low value is more suitable for long queries

  • Can tune l to optimize performance

    • Perhaps make it dependent on document size (cf. Dirichlet prior or Witten-Bell smoothing)

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