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st: Dropping variables


From   "Pradeep Kurukulasuriya" <pradeep.kurukulasuriya@yale.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Dropping variables
Date   Wed, 3 Nov 2004 22:42:17 -0500

I have  a large dataset with a lot of variables. I am trying to get rid of a
subset of the variables subject to a IF condition. I thought of  doing this
in a loop such as the following:

foreach var of varlist soils*{
sum `var'
drop `var' if r(mean)==0
}

However, the above doesn't work because stata doesn't like line 3. Is there
a way around this or another way to get rid of particular variables subject
to an IF condition?

Thanks
Pradeep



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