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Re: st: STATA equivalent to SAS subsetting "else if" statements?


From   Joseph Coveney <jcoveney@bigplanet.com>
To   Statalist <statalist@hsphsun2.harvard.edu>
Subject   Re: st: STATA equivalent to SAS subsetting "else if" statements?
Date   Wed, 09 Jul 2003 11:12:38 +0900

Bryan Sayer, responding to a question from Nick Cox, posted:

.N is a special missing, to distinguish NIU, from don't know, refused,
invalid, etc.

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Is there a convention for special missing values to distinguish the reason for 
missing values, such as .N reserved for not-in-universe (NIU)?  

If so, is there a reference for an agreed-upon list of special missing values 
of this nature?  In a quick Google search, I could only find a limited list in 
a couple of documents by Stephen Blumberg from the U.S. Centers for Disease 
Control.  If there's a formal convention among survey researchers, or even a 
widespread informal standard, I'd rather use it than something ad hoc.

Joseph Coveney



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