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st: coding of factor variables


From   "Sun, Yan (IFPRI)" <Y.SUN@cgiar.org>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: coding of factor variables
Date   Sat, 4 Jun 2011 17:03:30 -0400

Hi,

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 i.group
Predict xb, xb
How do I calculate xbb1? Could I write xbb1=xb-b[i.group]*i.group? Since
My problem is that I am not able write all of these 400 groups in the
code. 

Thank you very much.

Yan Sun
IFPRI

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