- statsmodels.stats.weightstats._zstat_generic(value1, value2, std_diff, alternative, diff=0)¶
generic (normal) z-test based on summary statistic
- The test statistic is :
tstat = (value1 - value2 - diff) / std_diff
and is assumed to be normally distributed.
Value, for example mean, of the first sample.
Value, for example mean, of the second sample.
Standard error of the difference value1 - value2
The alternative hypothesis, H1, has to be one of the following
‘two-sided’ : H1:
value1 - value2 - diffnot equal to 0.
‘larger’ : H1:
value1 - value2 - diff > 0
‘smaller’ : H1:
value1 - value2 - diff < 0
value of difference
value1 - value2under the null hypothesis