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# scipy.stats.mstats.variation

`scipy.stats.mstats.``variation`(a, axis=0)

  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

  [R348] | Zwillinger, D. and Kokoska, S. (2000). CRC Standard Probability and Statistics Tables and Formulae. Chapman & Hall: New York. 2000.