The gamma statistic is defined by
 |
where 
are cumulants and 
is the standard deviation.
Gamma Statistic
See also
Kurtosis, SkewnessExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Gamma Statistic." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/GammaStatistic.html