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Kinds of Exceptions and their Computation

  • Parameters
    • SelfExp: surprise of cell relative to other cells at same level of aggregation
    • InExp: surprise beneath the cell
    • PathExp: surprise beneath cell for each drill-down path
  • Computation of exception indicator (modeling fitting and computing SelfExp, InExp, and PathExp values) can be overlapped with cube construction
  • Exception themselves can be stored, indexed and retrieved like precomputed aggregates

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