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st: Loop over all unique values of a variable


From   "Peter Dijkstra" <ptdijkstra@gmx.net>
To   statalist@hsphsun2.harvard.edu
Subject   st: Loop over all unique values of a variable
Date   Thu, 14 Feb 2008 09:46:02 +0100

Dear Statalisters,

I want to perform regressions on subsets of the data, and therefore I want to loop over all unique (numerical) values of this variable. However, using foreach or forvalues only results in a loop over the variable name!
   foreach x in strata_id {
      regress y x1 x2 if strata_id == `x'
   }
Now the regression is performed if strata_id == "strata_id".
Any help would be appreciated!

Cheers, Peter
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