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
[R221] Zwillinger, D. and Kokoska, S. (2000). CRC Standard Probability and Statistics Tables and Formulae. Chapman & Hall: New York. 2000.