SciPy

scipy.stats.mstats.variation

scipy.stats.mstats.variation(a, axis=0)[source]

Computes the coefficient of variation, the ratio of the biased standard deviation to the mean.

Parameters:

a : array_like

Input array.

axis : int or None, optional

Axis along which to calculate the coefficient of variation. Default is 0. If None, compute over the whole array a.

References

[R407]Zwillinger, D. and Kokoska, S. (2000). CRC Standard Probability and Statistics Tables and Formulae. Chapman & Hall: New York. 2000.