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st: Working with groups

Subject   st: Working with groups
Date   Thu, 10 Apr 2008 17:38:27 +0200 (CEST)

Dear Statalist,

I am trying to model the effect of a treatment (x-variable) on an
outcome (y-variable). My database contains information of several regions,
how could I work only with two regions? Is there any specific command?
Thanks a lot.

Alejandra Molina

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