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st: What is i. ?

From   "Solorzano, Jenniffer" <jenniffers@IADB.ORG>
To   <>
Subject   st: What is i. ?
Date   Thu, 10 Jul 2008 15:36:36 -0400


Somebody knows what does it mean "i.variable name"? What does it mean i.
before the name of a variable?. I'm trying to run a instrumental
variable regression and I'm trying to understand a do-file somebody gave

This is the do-file part:

xi: ivreg lagreg3pcpc (lypc = lmiem e0_4 e5_8 e9_12 e13_17 e18_24 e25_54
e55_99 ultimoaprjef edadjefe i.region) ultimoaprjef edadjefe if PPA05==1


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