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st: The sample reduces when running logistic regressions

From   liliana <>
Subject   st: The sample reduces when running logistic regressions
Date   Tue, 17 Dec 2013 09:25:27 -0800 (PST)


I am running a logistic regression on different samples using multiple

mi estimate, or post: logit Y X1 X2, vce(cluster PSU)

I have run the regression for the first samples and Stata gave me back
results where all the observations are included, except for one sample for
which I have got 1332 observations but 1292 observations were taken by Stata
for the regression. In addition, the categorical variable education
( which takes values 0, 1, 2, and 3) presents a problem: is the baseline, for and Stata gives me
back the relative coefficient, whereas is omitted although there
are 168 observations. 

Which could be the causes of these two problems? 

Thanks in advance. 

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