Research and Development in Information Retrieval

Volume 146 of the series Lecture Notes in Computer Science pp 151-173


An evaluation of term dependence models in information retrieval

  • G. SaltonAffiliated withDepartment of Computer Science, Cornell University
  • , C. BuckleyAffiliated withDepartment of Computer Science, Cornell University
  • , C. T. YuAffiliated withDepartment of Information Engineering, University of Illinois/Chicago Circle

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In practical retrieval environments the assumption is normally made that the terms assigned to the documents of a collection occur independently of each other. The term independence assumption is unrealistic in many cases, but its use leads to a simple retrieval algorithm. More realistic retrieval systems take into account dependencies between certain term pairs and possibly between term triples. In this study, methods are outlined for generating dependency factors for term pairs and term triples and for using them in retrieval. Evaluation output is included to demonstrate the effectiveness of the suggested methodologies.