Skewness

Skewness defines the degree of asymmetry of the distribution around its central value.

Skewness is defined as

where
σ = standard deviation of x
N = total number of values of x

Skewness is a unitless parameter known as the third order moment of a distribution. Even if the skewness is other than zero it does not necessarily mean that the data is in fact skewed. When the skewness is larger than the standard deviation of the data then the data may be described as skewed with confidence.

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Subjects: Mathematics