How to Calculate Outliers: 10 Steps (with Pictures) - wikiHow**How** to Calculate **Outliers**. In statistics, an **outlier** is a data point that significantly differs from the other data points in a sample. Often, **outliersin** a data set can alert statisticians to experimental abnormalities or errors in the measurements taken, which may cause them to omit the **outliers** from.

Mathwords: Outlier

One definition of **outlier** is any data point more than 1.5 interquartile ranges (IQRs) below the first quartile or above the third quartile. Note: The IQR definition given here is widely used but is not the last word in determining whether a given number is an **outlier**.

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