Tests whether a dataset has normal kurtosis
This function tests the null hypothesis that the kurtosis of the population from which the sample was drawn is that of the normal distribution: kurtosis=3(n-1)/(n+1).
| Parameters : | a : array 
 axis : int or None 
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| Returns : | p-value : float 
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Notes
Valid only for n>20. The Z-score is set to 0 for bad entries.