7.10.7.7. statsmodels.stats.weightstats.ztost¶

statsmodels.stats.weightstats.ztost(x1, low, upp, x2=None, usevar='pooled', ddof=1.0)[source]¶

Equivalence test based on normal distribution

Parameters:	x1 : array_like one sample or first sample for 2 independent samples low, upp : float equivalence interval low < m1 - m2 < upp x1 : array_like or None second sample for 2 independent samples test. If None, then a one-sample test is performed. usevar : string, ‘pooled’ If pooled, then the standard deviation of the samples is assumed to be the same. Only pooled is currently implemented.
Returns:	pvalue : float pvalue of the non-equivalence test t1, pv1 : tuple of floats test statistic and pvalue for lower threshold test t2, pv2 : tuple of floats test statistic and pvalue for upper threshold test

Notes

checked only for 1 sample case