Isabelle,
see -help duplicates-. -duplicates drop siren- should do the trick.
HTH,
Eva
2009/2/21 <[email protected]>:
> Hello,
>
> I'm new in using Stata and I have a dataset with french
> firms'immatriculation numbers (this variable is called siren). I would
> like to drop observations when the same siren appears for the second, the
> third...time, but I don't achieve to do that.
> Thank you very much for your help.
>
> Yours sincerly,
>
> Isabelle Roux
>
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