statsmodels.stats.weightstats.ttest_ind
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statsmodels.stats.weightstats.ttest_ind(x1, x2, alternative='two-sided', usevar='pooled', weights=(None, None), value=0)
[source] -
ttest independent sample
convenience function that uses the classes and throws away the intermediate results, compared to scipy stats: drops axis option, adds alternative, usevar, and weights option
Parameters: 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. Ifunequal
, then Welsh ttest with Satterthwait degrees of freedom is usedweights : tuple of None or ndarrays
Case weights for the two samples. For details on weights see
DescrStatsW
value : float
difference between the means under the Null hypothesis.
Returns: tstat : float
test statisic
pvalue : float
pvalue of the t-test
df : int or float
degrees of freedom used in the t-test
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