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There is no agreed definition of an outlier. There are some definitions based on the median (Q2) and the quartiles Q1, and Q3.

Let the inter-quartile range, IQR = Q3 - Q1.

A number is a n outlier if it is:

  • less than Q1 - k*IQR or
  • greater than Q3 + k*IQR.

A popular choice for k is 1.5

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9y ago

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