Take a look at -help duplicates- and -help isid-
_______________________
Jorge Eduardo Pérez Pérez
On Wed, Oct 19, 2011 at 10:58 AM, Nina YIN <yinnina.ccer@gmail.com> wrote:
> Dear all,
>
> I want to merge two large datasets, before I merge them, I checked
> whether id variables(applno productno) uniquely identify observations:
> "by applno productno:assert _N==1", it turns out "4 contradictions in
> 26586 by-groups ", then I want to figure out what's the problem with
> these 4 contradictions. However I don't know how to find out where
> they are? Do you have any suggestions? Thanks a lot!
>
>
>
> --
> Best Regards,
> Nina YIN
>
>
> Toulouse School of Economics
> Manufacture des Tabacs
> 21 Allee de Brienne
> Toulouse, 31000, France
> Tel: 0033-(0)5 6123 8348
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>
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