Visual evaluation of outlier detection models

  • Authors:
  • Elke Achtert;Hans-Peter Kriegel;Lisa Reichert;Erich Schubert;Remigius Wojdanowski;Arthur Zimek

  • Affiliations:
  • Institut für Informatik, Ludwig-Maximilians-Universität München, München, Germany;Institut für Informatik, Ludwig-Maximilians-Universität München, München, Germany;Institut für Informatik, Ludwig-Maximilians-Universität München, München, Germany;Institut für Informatik, Ludwig-Maximilians-Universität München, München, Germany;Institut für Informatik, Ludwig-Maximilians-Universität München, München, Germany;Institut für Informatik, Ludwig-Maximilians-Universität München, München, Germany

  • Venue:
  • DASFAA'10 Proceedings of the 15th international conference on Database Systems for Advanced Applications - Volume Part II
  • Year:
  • 2010

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Abstract

Many outlier detection methods do not merely provide the decision for a single data object being or not being an outlier. Instead, many approaches give an “outlier score” or “outlier factor” indicating “how much” the respective data object is an outlier. Such outlier scores differ widely in their range, contrast, and expressiveness between different outlier models. Even for one and the same outlier model, the same score can indicate a different degree of “outlierness” in different data sets or regions of different characteristics in one data set. Here, we demonstrate a visualization tool based on a unification of outlier scores that allows to compare and evaluate outlier scores visually even for high dimensional data.