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st: sample size

From   Nirina F <>
Subject   st: sample size
Date   Tue, 29 Sep 2009 08:35:30 -0400

hello all,

When I run ivreg2, my sample size dropped from 2445 to 2122.
What is the logic behind this sample drop?
Also, I restricted the plain reg with if e(sample) so that I have now
2122 in my OLS but is it ok to do that? I mean what is the meaning
econometrically of restricting the sample size to be the same?

Thank you in advance fo rtaking the time to respond.
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