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st: RE: Merging database


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Merging database
Date   Wed, 29 Apr 2009 17:33:27 +0100

Use -egen, group() label- or -egen, concat()-. Also study 

FAQ     . . . . . . . . . . . . . . . . . . . . . . Creating group identifiers
        3/01    How do I create individual identifiers numbered
                from 1 upwards?
                http://www.stata.com/support/faqs/data/group.html

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

SERGIO M. AFCHA CHÁVEZ

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?

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