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Re: st: RE: Detect use of svy: prefix


From   Richard Williams <richardwilliams.ndu@gmail.com>
To   statalist@hsphsun2.harvard.edu, <statalist@hsphsun2.harvard.edu>
Subject   Re: st: RE: Detect use of svy: prefix
Date   Wed, 25 May 2011 17:04:28 -0500

At 11:25 AM 5/25/2011, David Radwin wrote:
It seems to be the case that e(prefix) will include the value "svy" after
running a svy: command. So you could try something like this

. if strpos("`e(prefix)'","svy")==0 error

adding an error number if you care to.

David, I tweaked your idea a bit:

if strpos("`0'","[iw=_")!=0 error 198

Why? As far as I can tell, if svy: has been used, the command line will include "[iw=_" At least I hope so. :) I should try it out a few thousand times to be sure though. Assuming I am right, I can further tweak the code to distinguish between when svy is ok to use and when it isn't. Still not a perfect solution though, because even if I am right, Stata could zap me by making changes in the svy prefix, e.g. using "iweight" instead of "iw" .


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Richard Williams, Notre Dame Dept of Sociology
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