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st: how to run nbreg with "if" command?

From   sarah smith <[email protected]>
To   [email protected]
Subject   st: how to run nbreg with "if" command?
Date   Mon, 14 Mar 2005 15:36:48 -0500

Dear stata users;

I am trying to run nbreg as below;

nbreg y x1 x2 if x3==1

where x3 is a dummy variable and I want to do the regression only
using the observations where x3 is equal to 1. However I receive an
error message saying that "if is not allowed". Could you suggest a way
to do this?

Thank you very much,
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