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Re: st: RE: confirm a variable is an identifiant

From   Jean-Benoit Hardouin <>
Subject   Re: st: RE: confirm a variable is an identifiant
Date   Wed, 24 Jun 2009 21:16:40 +0200

Thank you very much Stas, Nick and  Philipp

Nick Cox a écrit :
The official command -isid- is designed for precisely this purpose. For a full and wider-ranging discussion, see
SJ-8-4  dm0042  . . . . . . . . . . . .  Speaking Stata: Distinct
        (help distinct if installed)  . . . . . .  N. J. Cox and G. M.
        Q4/08   SJ 8(4):557--568
        shows how to answer questions about distinct observations
        from first principles; provides a convenience command

Jean-Benoit Hardouin

I search to verify if a variable is an identifiant that is to say that each row of a file have a different value on this variable than all the others rows. I want to use the -inspect- to compare the number of "unique value" (if the number of unique value is equal to the number of individual then the

variable is an identifiant) but -inspect- don't count the number of different values if this number is superior to 100.
Have someone an idea ?

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Jean-Benoit Hardouin, PhD
Maitre de Conférences - Assistant Professor
EA 4572 "Biostatistics, Clinical Research and Subjective Measures in Health Sciences"

Departement of Biomathematics and Biostatistics
Faculty of Pharmaceutical Sciences
University of Nantes
1, rue Gaston Veil - BP 53508 44035 Nantes Cedex 1 - FRANCE Email : Personal website :
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