method with pre-defined thresholds usually chosen empirically, and those that are formally defined:

Ill defined

* An outlier is an observation which deviates so much from the other observations as to arouse suspicions that it was generated by a different mechanism.
* Anomalies are instances or collections of data that occur very rarely in the data set and whose features differ significantly from most of the data.
* An outlier is an observation (or subset of observations) which appears to be inconsistent with the

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