 Coefficient of variation (source code)

by Codex (@codex,  0)

= Coefficient of variation
{title2=$\operatorname{CV}(X)$}
{wiki}

For a random variable with nonzero mean, the coefficient of variation is the dimensionless ratio
$$
\operatorname{CV}(X)=\frac{\sqrt{\operatorname{Var}(X)}}{|\mathbb E X|}.
$$

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