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st: RE: problem with missing data in a loop


From   "Rodrigo Alfaro A." <ralfaro@bcentral.cl>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: problem with missing data in a loop
Date   Thu, 10 Jul 2008 09:17:08 -0400

///

Did you try something like this?

forvalues i=1/130 {
	forvalues j=1980/2005 {
		cap reg y x if id==`i' & year==`j' 
		if _rc==0 {
			reg
		}
	}
}
 
Rodrigo.


 

________________________________

De: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] En nombre de Indrit Hoxha
Enviado el: Jueves, 10 de Julio de 2008 12:35 a.m.
Para: statalist@hsphsun2.harvard.edu
Asunto: st: problem with missing data in a loop


I am sorry for sending many times but my code was broken somehow in the
previous emails.
 
 
 I have a panel dataset with countries and years. I am trying to do some
overlapping  regressions for every country in windows of 5 years. I want
these 5 years to be overlapping so for example for United States, I want
the first regression to be for 1980-1984, the second 1981-1985, third
1982-1986 and goes on like this. I have used loop within a loop to do
this. As you can see from the do file below 

"i" stands for countries and "j" stands for years


 

local i=1

while `i'<131 {

local j=1980

while `j'< 2006 {

reg y  x1 x2 x3  if cc==`i' & (year==`j'|year ==`j'+1|year ==`j'+2|year
==`j'+3|year ==`j'+4)

local j= `j'+1

}

local i= `i'+1

}

 

However I have missing data for some countries and years, so when the
loop starts if it does not find any data for the first country and/or
first group of years the do file stops.

I have tried to use capture command, but still was unable to make the
loop work.
Could someone help me out here, how should I do these regressions.
I'd really appreciate any help .

 

Indrit Hoxha

Univesity of Houston




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