statsmodels.stats.proportion.proportions_ztost¶

statsmodels.stats.proportion.proportions_ztost(count, nobs, low, upp, prop_var='sample')[source]¶

Equivalence test based on normal distribution

Parameters:

count ({int, array_like}) – the number of successes in nobs trials. If this is array_like, then the assumption is that this represents the number of successes for each independent sample
nobs (int) – the number of trials or observations, with the same length as count.
low (float) – equivalence interval low < prop1 - prop2 < upp
upp (float) – equivalence interval low < prop1 - prop2 < upp
prop_var (str or float in (0, 1)) – prop_var determines which proportion is used for the calculation of the standard deviation of the proportion estimate The available options for string are ‘sample’ (default), ‘null’ and ‘limits’. If prop_var is a float, then it is used directly.

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