Definition:Skewness

Definition
Skewness is a measure of the asymmetry of a probability distribution about its mean.

Let $X$ be a random variable with mean $\mu$ and standard deviation $\sigma$.

Then the skewness of $X$, $\gamma_1$, is given by the expectation:


 * $\gamma_1 = \expect {\paren {\dfrac {X - \mu} \sigma}^3}$