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st: selecting variables by their format


From   TEWODAJ MOGUES <tmogues@students.wisc.edu>
To   Stata _ <statalist@hsphsun2.harvard.edu>
Subject   st: selecting variables by their format
Date   Wed, 14 Sep 2005 13:36:15 -0400

I have a quick question about how to select variables by their format. 
Suppose I want to drop (or rename, or do something else) with all 
string variables. Clearly, 
-drop if- doesn't work as that selects observations, not variables. 

The motivation for this question is that I want to collapse a whole 
dataset by some variable: 
collapse *, by(somevar)
Specifically, I want to get the mean of all numeric variables by 
somevar, and get the highest "value" in alphabetical order of the 
string variables by somevar. So if there is no way to do this in one go 
using -collapse-, I would collapse separately for the numeric and the 
string vars, and for that purpose I need to find a way to select 
variables by their format.

Thanks for any guidance on this!
Tewodaj
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