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Re: st: coding of factor variables

From   Maarten Buis <>
Subject   Re: st: coding of factor variables
Date   Sun, 5 Jun 2011 09:55:01 +0200

On Sat, Jun 4, 2011 at 11:03 PM, Sun, Yan (IFPRI) wrote:
> Part I, when I have three groups, I create dummies for group1 and group2
> (treating group3 as a base):
> My equation is reg y x z group1 group2
> I want to calculate:
> predict xb, xb
> gen xbb1=xb-_b[group1]*group1-_b[group2]*group2
> Part II, when I have 400 groups now
> My equation now is: xi: reg y x z
> Predict xb, xb
> How do I calculate xbb1? Could I write xbb1=xb-b[]* Since
> My problem is that I am not able write all of these 400 groups in the
> code.

Typically you do not add that many dummies but use -xtreg , fe-
instead (or -areg-). After -xtreg- you can still -predict- the fixed
effects (what you called xbb1), see the -predict- section of -help
xtreg postestimation-.

Hope this helps,

Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
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