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st: Confirm existence of a variable(s) with wildcards in the variable name


From   Will Probert <willprobert@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Confirm existence of a variable(s) with wildcards in the variable name
Date   Wed, 2 Feb 2011 12:12:53 +1000

Hi,
I'm trying to unabbreviate a variable list that contains a wildcard
and then keep those variables, if the variable(s) exist.  From my
understanding, the 'if' option in STATA's 'keep' and 'drop' commands
only act on observations, not on variables.

I'm trying code, unsuccessfully, along the lines of...

capture confirm unab new: varia*
if(_rc==0){
     unab new: varia*
     local newlist `new'
}
keep `newlist'

Any help would be much appreciated.
Regards,
Will Probert

Research Assistant
Institute for Social Science Research
The University of Queensland

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