Prioritizing Information for the Discovery of Phenomena

  • Authors:
  • Paul Helman;Rebecca Gore

  • Affiliations:
  • Department of Computer Science, University of New Mexico, Albuquerque, New Mexico 87131;Brigham and Women‘s Hospital, Channing Laboratory, Boston, Massachusetts 02115-5804

  • Venue:
  • Journal of Intelligent Information Systems
  • Year:
  • 1998

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Abstract

We consider the problem of prioritizing a collection of discrete piecesof information, or transactions. The goal is to rank the transactionsin such a way that the user can best pursue a subset of the transactionsin hopes of discovering those which were generated by an interestingsource. The problem is shown to differ from traditional classification inseveral fundamental ways. Ranking algorithms are divided into classes,depending on the amount of information they may utilize. We demonstratethat while ranking by the least constrained algorithm class is consistentwith classification, such is not the case for a more constrainedclass of algorithms. We demonstrate also that while optimal ranking bythe former class is “easy”, optimal ranking by the latter class is NP-hard.Finally, we present detectors which solve optimally restricted versionsof the ranking problem, including symmetric anomaly detection.