st: Re: to check if a variable already exists

["Martin Weiss" <martin.weiss1@gmx.de>]

-h confirm new-

HTH
Martin
_______________________
----- Original Message ----- 
From: "Jacob Wegelin" <jwegelin@vcu.edu>
To: <statalist@hsphsun2.harvard.edu>
Sent: Tuesday, October 07, 2008 12:20 AM
Subject: st: to check if a variable already exists



> Is there a way to check whether a variable is already defined, already 
> exists? I'd like to write code of the following sort:
>
>
> if (variable called performance is not yet defined) {
>  gen performance=.
>  }
> replace performance=5 if name=George
>
> Thanks for any ideas
>
> Jake
>
> Jacob A. Wegelin
> jwegelin@vcu.edu Assistant Professor
> Department of Biostatistics
> Virginia Commonwealth University
> 730 East Broad Street Room 3006
> P. O. Box 980032
> Richmond VA 23298-0032
> U.S.A. http://www.people.vcu.edu/~jwegelin
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