- scipy.stats.mstats.normaltest(a, axis=0)[source]¶
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 [R246], [R247] test that combines skew and kurtosis to produce an omnibus test of normality.
a : array_like
The array containing the data to be tested.
axis : int or None
If None, the array is treated as a single data set, regardless of its shape. Otherwise, each 1-d array along axis axis is tested.
k2 : float or array
s^2 + k^2, where s is the z-score returned by skewtest and k is the z-score returned by kurtosistest.
p-value : float or array
A 2-sided chi squared probability for the hypothesis test.
[R246] (1, 2) D’Agostino, R. B. (1971), “An omnibus test of normality for moderate and large sample size,” Biometrika, 58, 341-348 [R247] (1, 2) D’Agostino, R. and Pearson, E. S. (1973), “Testing for departures from normality,” Biometrika, 60, 613-622