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st: RE: unique values


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: unique values
Date   Tue, 7 Jun 2005 17:27:58 +0100

In Stata 9, this is done by -levelsof-. 

In Stata 8, this is done by -levels-. 

In Stata 7, this is done by -vallist- from SSC. 

See also the FAQ 

FAQ     . . . . . . . . . . Making foreach go through all values of a variable
        4/03    Is there a way to tell Stata to try all values of a
                particular variable in a foreach statement without
                specifying them?
                http://www.stata.com/support/faqs/data/foreach.html

Incidentally, if your values were contained
in a local called uniqlist, you use its name, as follows: 

foreach uniqval of local uniqlist {
   <execute code> 
}

Nick 
n.j.cox@durham.ac.uk 

Stephen R. Hale, Ph.D.
 
> I'm new to the list.  Can anyone direct me to an efficient, 
> preferrably
> already existing way to get the unique values of a 
> categorical variable into
> a macro.  The goal is just like creating a "by", but I need 
> to have the
> unique values list.  Let's say I can get the unique values in 
> the macro
> uniqlist.
> 
> I then want to be able to loop over all unique values in the list
> 
> Foreach uniqval of local `uniqlist' {
>   execute code
> }
 

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