st: Re: Command to identify number of unique individuals

[José Maria <jmpsouza@usp.br>]

<>
may be -distinct-, from SSC, writen by Nick Cox?
José Maria
Jose Maria Pacheco de Souza, Professor Titular (aposentado)
Departamento de Epidemiologia/Faculdade de Saude Publica, USP
Av. Dr. Arnaldo, 715
01246-904  -  S. Paulo/SP - Brasil
fones (11)3061-7747; (11)3768-8612;(11)3714-2403
www.fsp.usp.br/~jmpsouza
----- Original Message ----- 
From: "Weichle, Thomas" <Thomas.Weichle@va.gov>
To: <statalist@hsphsun2.harvard.edu>
Sent: Monday, December 28, 2009 4:05 PM
Subject: st: Command to identify number of unique individuals


> Hi Statalisters,
> Is there a command that will list the number of unique individuals in my
> dataset?  I'm familiar with the duplicates and dups commands, but these
> aren't showing me the number of unique individuals.
> It should be equivalent to the following SAS command which will identify
> the number of unique observations by study_id:
>
> PROC SORT NODUPKEY DATA=test;
> BY study_id;
> RUN;
>
> Tom Weichle
> Math Statistician
> Center for Management of Complex Chronic Care (CMC3)
> Hines VA Hospital, Bldg 1, C202
> 708-202-8387 ext. 24261
> Thomas.Weichle@va.gov
>
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