Tests whether a sample differs from a normal distribution.
This function tests the null hypothesis that a sample comes from a normal distribution. It is based on D’Agostino and Pearson’s [R93], [R94] test that combines skew and kurtosis to produce an omnibus test of normality.
Parameters :  a : array_like
axis : int or None


Returns :  k2 : float or array
pvalue : float or array

References
[R93]  (1, 2) D’Agostino, R. B. (1971), “An omnibus test of normality for moderate and large sample size,” Biometrika, 58, 341348 
[R94]  (1, 2) D’Agostino, R. and Pearson, E. S. (1973), “Testing for departures from normality,” Biometrika, 60, 613622 