If you do programming, NC151 will be useful (see a recent announcement
on this list).
Eva
2008/10/6 Jacob Wegelin <[email protected]>:
>
> 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
> [email protected] 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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