SciPy

scipy.stats.kurtosis

scipy.stats.kurtosis(a, axis=0, fisher=True, bias=True)[source]

Computes the kurtosis (Fisher or Pearson) of a dataset.

Kurtosis is the fourth central moment divided by the square of the variance. If Fisher’s definition is used, then 3.0 is subtracted from the result to give 0.0 for a normal distribution.

If bias is False then the kurtosis is calculated using k statistics to eliminate bias coming from biased moment estimators

Use kurtosistest to see if result is close enough to normal.

Parameters :

a : array

data for which the kurtosis is calculated

axis : int or None

Axis along which the kurtosis is calculated

fisher : bool

If True, Fisher’s definition is used (normal ==> 0.0). If False, Pearson’s definition is used (normal ==> 3.0).

bias : bool

If False, then the calculations are corrected for statistical bias.

Returns :

kurtosis : array

The kurtosis of values along an axis. If all values are equal, return -3 for Fisher’s definition and 0 for Pearson’s definition.

References

[R236]Zwillinger, D. and Kokoska, S. (2000). CRC Standard Probability and Statistics Tables and Formulae. Chapman & Hall: New York. 2000.

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