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Re: st: Loop over all unique values of a variable


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Loop over all unique values of a variable
Date   Thu, 14 Feb 2008 09:00:56 +0000 (GMT)

--- Peter Dijkstra <ptdijkstra@gmx.net> wrote:
> I want to perform regressions on subsets of the data, and therefore I
> want to loop over all unique (numerical) values of this variable.

You can get the unique values of a variable using the -levelsof-
command. See the example below:

*--------------- begin example -------------------
sysuse auto, clear
recode rep78 1/2 = 3

levelsof rep78
foreach lev in `r(levels)' {
	di _n _n as txt "rep78 = " as result `lev' 
	reg mpg wei if rep78 == `lev'
}
*---------------- end example --------------------
(For more on how to use examples I sent to the Statalist, see
http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html )

Hope this helps,
Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


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