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st: RE: Requirement(s) for a match merge


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Requirement(s) for a match merge
Date   Wed, 30 Mar 2005 17:40:24 +0100

Let's turn this round. If this is not true, 
how do you expect match merge to work? 

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

louis boakye-yiadom

> Is it true that "for a match merge to work, the identifier or 
> identifiers 
> must uniquely identify each observation"? I found this 
> statement in sample 
> lecture NC 101 (one of StataCorp's NetCourses), but I thought 
> that this 
> requirement (of the id uniquely identifying each observation) 
> is often 
> desirable, but not necessary in all cases. Any insights will 
> be appreciated. 

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