CompareMeans.ztest_ind(alternative='two-sided', usevar='pooled', value=0)[source]

z-test for the null hypothesis of identical means


x1, x2 : array_like, 1-D or 2-D

two independent samples, see notes for 2-D case

alternative : string

The alternative hypothesis, H1, has to be one of the following ‘two-sided’: H1: difference in means not equal to value (default) ‘larger’ : H1: difference in means larger than value ‘smaller’ : H1: difference in means smaller than value

usevar : string, ‘pooled’ or ‘unequal’

If pooled, then the standard deviation of the samples is assumed to be the same. If unequal, then the standard deviations of the samples may be different.

value : float

difference between the means under the Null hypothesis.


tstat : float

test statisic

pvalue : float

pvalue of the z-test