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st: loop that refers to global


From   "Savych, Bogdan" <savych@rand.org>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: loop that refers to global
Date   Tue, 24 Jun 2003 15:03:29 -0700

I want to write a do-file that uses loops to refer to some global macros.
Global macros define different variables that I want to use in different
regressions.  However, when I run program I receive an error.  Example of
the do-file is goes like this: 

version 7
global cov1="var3"
global cov2="var3 var4"
global cov3="var3 var4 var5"

local i=1
while `i'<=3 {
	logistic y var1 var2 $cov`i' 
	local i=`i'+1
}


After I run this do file it gives an error: 

1 invalid name
r(198);

Does this mean that I can not use loops that refer to macros?  What should I
change for this to run?  Any advise would be appreciated.  Option to write
explicitly each regression does sound quite attractive. 

Thanks, 

Bogdan Savych
Graduate Fellow 
RAND Graduate School
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