statsmodels.stats.weightstats._zstat_generic¶
-
statsmodels.stats.weightstats._zstat_generic(value1, value2, std_diff, alternative, diff=
0
)[source]¶ 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.
- Parameters:¶
- value1
float
orndarray
Value, for example mean, of the first sample.
- value2
float
orndarray
Value, for example mean, of the second sample.
- std_diff
float
orndarray
Standard error of the difference value1 - value2
- alternative
str
The alternative hypothesis, H1, has to be one of the following
‘two-sided’ : H1:
value1 - value2 - diff
not equal to 0.‘larger’ : H1:
value1 - value2 - diff > 0
‘smaller’ : H1:
value1 - value2 - diff < 0
- diff
float
value of difference
value1 - value2
under the null hypothesis
- value1
- Returns:¶
Last update:
Oct 29, 2024