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
alternative : string
usevar : string, ‘pooled’ or ‘unequal’
weights : tuple of None or ndarrays
value : float
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Returns: | tstat : float
pvalue : float
df : int or float
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