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Published in:
2013 | OriginalPaper | Chapter
Estimation of the Collection Parameter of Information Models for IR
Authors : Parantapa Goswami, Eric Gaussier
Published in: Advances in Information Retrieval
Publisher: Springer Berlin Heidelberg
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In this paper we explore various methods to estimate the collection parameter of the information based models for
ad hoc
information retrieval. In previous studies, this parameter was set to the average number of documents where the word under consideration appears. We introduce here a fully formalized estimation method for both the log-logistic and the smoothed power law models that leads to improved versions of these models in IR. Furthermore, we show that the previous setting of the collection parameter of the log-logistic model is a special case of the estimated value proposed here.