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Erschienen in:
1994 | OriginalPaper | Buchkapitel
Some Simple Effective Approximations to the 2-Poisson Model for Probabilistic Weighted Retrieval
verfasst von : S. E. Robertson, S. Walker
Erschienen in: SIGIR ’94
Verlag: Springer London
Enthalten in: Professional Book Archive
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The 2-Poisson model for term frequencies is used to suggest ways of incorporating certain variables in probabilistic models for information retrieval. The variables concerned are within-document term frequency, document length, and within-query term frequency. Simple weighting functions are developed, and tested on the TREC test collection. Considerable performance improvements (over simple inverse collection frequency weighting) are demonstrated.