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:¶

x1array_like

one sample or first sample for 2 independent samples

low, uppfloat

equivalence interval low < m1 - m2 < upp

x1array_like or None

second sample for 2 independent samples test. If None, then a one-sample test is performed.

usevarstr, ‘pooled’

If pooled, then the standard deviation of the samples is assumed to be the same. Only pooled is currently implemented.

Returns:¶

pvaluefloat

pvalue of the non-equivalence test

t1, pv1tuple of floats

test statistic and pvalue for lower threshold test

t2, pv2tuple of floats

test statistic and pvalue for upper threshold test

Notes

checked only for 1 sample case