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Re: st: confirm a variable is an identifiant

From   Philipp Rehm <>
Subject   Re: st: confirm a variable is an identifiant
Date   Wed, 24 Jun 2009 19:33:43 +0200

In addition, -isid- comes to mind.


Stas Kolenikov wrote:
bysort ID : assert _N == 1

I am sure this has been covered in Stata Journal Nick Cox' "Speaking
Stata" columns and tips.

On Wed, Jun 24, 2009 at 11:50 AM, Jean-Benoit
Hardouin<> wrote:
Dear all,
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
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 ?
Best regards,


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

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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