I am running a loop in Stata for various t-tests. The code I am using is:
ds s_a1_1 s_a1_4a s_a2 s_b3 s_b4 s_b5 s_b6 s_c7 s_c8 s_c9
global teach_vars_detail `r(varlist)'
ds m7saq10 m3sdq3_tsup m3sdq6_tsup m7sfq9_pknw_filter urban_rural
global teach_vars_basic `r(varlist)'
foreach var of varlist $teach_vars_detail teach_literacy_score teach_numeracy_score {
foreach x of varlist $teach_vars_basic {
ttest `var' if unique_teach_id!="" , by(`x')
}
}
I am getting the results I want but since the t-tests are for so many iterations, I was wondering if there was a way to identify from the result which variable was the t-test run on and which was the by variable in that particular result.
Two-sample t test with equal variances
------------------------------------------------------------------------------
Group | Obs Mean Std. err. Std. dev. [95% conf. interval]
---------+--------------------------------------------------------------------
0 | 98 3.622449 .0513141 .5079838 3.520605 3.724293
1 | 98 3.673469 .0518448 .5132374 3.570572 3.776367
---------+--------------------------------------------------------------------
Combined | 196 3.647959 .0364249 .5099481 3.576122 3.719796
---------+--------------------------------------------------------------------
diff | -.0510204 .0729453 -.1948881 .0928473
------------------------------------------------------------------------------
diff = mean(0) - mean(1) t = -0.6994
H0: diff = 0 Degrees of freedom = 194
Ha: diff < 0 Ha: diff != 0 Ha: diff > 0
Pr(T < t) = 0.2426 Pr(|T| > |t|) = 0.4851 Pr(T > t) = 0.7574
Insert a command within your inner loop before the ttest command, such as
display "`var', by(`x')"