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Re: st: How can I check that a variable exists?


From   Kyle Hood <kyle.hood@yale.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: How can I check that a variable exists?
Date   Thu, 12 Mar 2009 15:24:37 -0700

The command

. qui cap d xa

Sets _rc to 0 if xa exists, and 111 if not.  Thus,

. qui cap d xa
. if _rc == 0 {
. a // this is my action
. }

Kyle Hood
Department of Economics
Yale University

On Mar 12, 2009, at 3:16 PM, "Benjamin Villena Roldan" <bvillena@troi.cc.rochester.edu > wrote:

Dear statalist,
This may sound like a trivial question, but I unsuccessfully looked for an
answer so far.
I need to perform certain action A if there is a variable XA defined in the dta file, and an action B if there is a variable XB in the dta file. How
can I do so? Any ideas?

Thanks

Benjamin


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