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st: cmp - use of if or bys command

From   David Ashcraft <>
To   "" <>
Subject   st: cmp - use of if or bys command
Date   Wed, 25 Jul 2012 06:29:42 -0700 (PDT)

Hello Statalist,

My data is divided in three categories and I would like to run SUR using cmp command. However cmp command does not allow me to use "if" of "bys".

I want the following:

cmp(y=x if cat==1)(y=x if cat==2)(y=x if cat==3)

I looked in the statalist posting but could not any previous post. Any help would be highly appreciated.


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