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# What is the calculation that you use to find an outlier?

Updated: 9/25/2023

Wiki User

8y ago

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

Wiki User

8y ago

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Q: What is the calculation that you use to find an outlier?
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