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st: What is i. ?
Hi!
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
me.
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
Thanks
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