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st: Merging database


From   "SERGIO M. AFCHA CHÁVEZ" <s.afcha@ub.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: Merging database
Date   Wed, 29 Apr 2009 17:55:27 +0200

Dear Statlisters,

I have a little problem merging a data base. I have variables for 3 years showing an ID:


V1  V2  V3
1     .       1
2     .       2
3    3       3
4 4 . . 5 5
6     .       6


I need only one ID variable. How can I obtain one column with all the ID numbers?

Thanks in advance for your help.

Sergio

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