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Types of Outliers (cont')

  • Collective Outliers
    • A subset of data objects collectively deviate significantly from the whole data set, even if the individual data objects may not be outliers
    • Applications: E.g., intrusion detection:
      • When a number of computers keep sending denial-of-service packages to each other
  • Detection of collective outliers
    • Consider not only behavior of individual objects, but also that of groups of objects
    • Need to have the background knowledge on the relationship among data objects, such as a distance or similarity measure on objects.
  • A data set may have multiple types of outlier
  • One object may belong to more than one type of outlier

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