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Data & Analytics · Intermediate

Skewness

A measure of a distribution's asymmetry: right (positive) skew has a long right tail, left (negative) skew a long left tail.

Definition

Income, sales and wait times are typically right-skewed. Log or square-root transformations can reduce skew before modeling.

Exam tip

The tail points in the direction of the skew; right skew pulls the mean above the median.

Related terms