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Use of Topicality and Information Measures to Improve Document Representation for Story Link Detection

  • Chirag Shah
  • Koji Eguchi
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4425)

Abstract

Several information organization, access, and filtering systems can benefit from different kind of document representations than those used in traditional Information Retrieval (IR). Topic Detection and Tracking (TDT) is an example of such a domain. In this paper we demonstrate that traditional methods for term weighing does not capture topical information and this leads to inadequate representation of documents for TDT applications. We present various hypotheses regarding the factors that can help in improving the document representation for Story Link Detection (SLD) - a core task of TDT. These hypotheses are tested using various TDT corpora. From our experiments and analysis we found that in order to obtain a faithful representation of documents in TDT domain, we not only need to capture a term’s importance in traditional IR sense, but also evaluate its topical behavior. Along with defining this behavior, we propose a novel measure that captures a term’s importance at the corpus level as well as its discriminating power for topics. This new measure leads to a much better document representation as reflected by the significant improvements in the results.

Keywords

Noun Phrase Document Representation Core Task Topic Detection Topicality Score 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Berlin Heidelberg 2007

Authors and Affiliations

  • Chirag Shah
    • 1
  • Koji Eguchi
    • 1
  1. 1.National Institute of Informatics (NII), Tokyo 101-8430Japan

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