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Re: Re : st: RE: merge more than two database


From   Maarten Buis <maartenlbuis@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: Re : st: RE: merge more than two database
Date   Fri, 8 Jul 2011 13:52:41 +0200

On Fri, Jul 8, 2011 at 1:20 PM, stephanie fotsing wrote:
> But i want to know which command i must use, because i have some problem to do it.
> in fact i have merged two database and i wanted to add another one, but it's not possible.
>
> it's mark "variable do not uniquely identify observations in the master data"

That means there is a problem in one or more of your datasets. Lots of
information on how diagnose such problems can be found here:

http://blog.stata.com/2011/04/18/merging-data-part-1-merges-gone-bad/
http://blog.stata.com/2011/05/27/merging-data-part-2-multiple-key-merges/

Hope this helps,
Maarten

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany


http://www.maartenbuis.nl
--------------------------
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