2.NounA measure of the asymmetry of the probability distribution of a real-valued random variable; is the third standardized moment, defined as
γ
1
=
μ
3
σ
3
,
{\displaystyle \scriptstyle \gamma _{1}={\frac {\mu _{3}}{\sigma ^{3}}},\!}
where
μ
3
{\displaystyle \mu _{3}}
is the third moment about the mean and
σ
{\displaystyle \sigma }
is the standard deviation.