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Re: st: RE: Merging database


From   Jeffrey Roberts <jeffrey.a.roberts@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: Merging database
Date   Wed, 29 Apr 2009 12:38:27 -0400

gen id=_n
* assigns the input line number to the observation

On Wed, Apr 29, 2009 at 12:33 PM, Nick Cox <n.j.cox@durham.ac.uk> wrote:
> 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?
>
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
>

*
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