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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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