Combining evidence for relevance criteria: a framework and experiments in web retrieval

  • Authors:
  • Theodora Tsikrika;Mounia Lalmas

  • Affiliations:
  • Department of Computer Science, Queen Mary, University of London, UK;Department of Computer Science, Queen Mary, University of London, UK

  • Venue:
  • ECIR'07 Proceedings of the 29th European conference on IR research
  • Year:
  • 2007

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Abstract

We present a framework that assesses relevance with respect to several relevance criteria, by combining the query-dependent and query-independent evidence indicating these criteria. This combination of evidence is modelled in a uniform way, irrespective of whether the evidence is associated with a single document or related documents. The framework is formally expressed within Dempster-Shafer theory. It is evaluated for web retrieval in the context of TREC's Topic Distillation task. Our results indicate that aggregating content-based evidence from the linked pages of a page is beneficial, and that the additional incorporation of their homepage evidence further improves the effectiveness.