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st: Excluding missing values


From   Tunga Kantarci <kantarci@uvt.nl>
To   statalist@hsphsun2.harvard.edu
Subject   st: Excluding missing values
Date   Wed, 2 Apr 2008 13:50:32 +0200

To exclude missing values, stata help indiactes one should use 

<.

However, 

!=.

also works.

In which situation the second command would be faulty?



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