SciPy

scipy.stats.shapiro

scipy.stats.shapiro(x, a=None, reta=False)[source]

Perform the Shapiro-Wilk test for normality.

The Shapiro-Wilk test tests the null hypothesis that the data was drawn from a normal distribution.

Parameters :

x : array_like

Array of sample data.

a : array_like, optional

Array of internal parameters used in the calculation. If these are not given, they will be computed internally. If x has length n, then a must have length n/2.

reta : bool, optional

Whether or not to return the internally computed a values. The default is False.

Returns :

W : float

The test statistic.

p-value : float

The p-value for the hypothesis test.

a : array_like, optional

If reta is True, then these are the internally computed “a” values that may be passed into this function on future calls.

See also

anderson
The Anderson-Darling test for normality

References

[R261]http://www.itl.nist.gov/div898/handbook/prc/section2/prc213.htm

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