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st: RE: check whether a variable has any missing values


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: check whether a variable has any missing values
Date   Sun, 29 Mar 2009 17:33:57 +0100

Jacob Wegelin posted a program based on repeated -tabulate-s to 
check whether a variable contains any missing values. 

Eva Poen suggested -count if missing(varname)- 

David Airey suggested -assert missing(varname)- or -assert
!missing(varname)-. 

Martin Weiss suggested -mdesc-, a user-written program by Rose Ann
Medeiros. 

Kit Baum pointed out that no program is necessary as you can loop over
your variables using -foreach-. 

Those who answered are all correct. Nevertheless, a convenience wrapper
for Kit's approach is downloadable as -nmissing-. 

SJ-5-4  dm67_3  . . . . . . . . . .  Software update for nmissing and
npresent
        (help nmissing if installed)  . . . . . . . . . . . . . . .  N.
J. Cox
        Q4/05   SJ 5(4):607
        now produces saved results

The latest public version requires Stata 8, but older versions are also
downloadable: -search- for locations. 

Nick 
n.j.cox@durham.ac.uk 




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