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Re: st: Command to identify number of unique individuals


From   Ben Jann <ben.jann@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Command to identify number of unique individuals
Date   Mon, 28 Dec 2009 21:39:42 +0100

maybe also try -panels-. See

 . ssc describe panels

ben

On Mon, Dec 28, 2009 at 7:45 PM, Martin Weiss <Martin.Weiss1@gmx.de> wrote:
> <>
>
> See the tips by Nick and coauthor here: http://www.stata.com/support/faqs/data/distinct.html
>
>
> For instance:
>
> ***
> clear*
> set obs 2000
> gen id=_n
> bys id: gen byte first =_n==1
> cou if first
> //now only 1999 unique
> clear*
> set obs 2000
> gen id=_n
> replace id=2 in 3
> bys id: gen byte first =_n==1
> cou if first
> ***
>
> HTH
> Martin
> -------- Original-Nachricht --------
>> Datum: Mon, 28 Dec 2009 12:05:41 -0600
>> Von: "Weichle, Thomas" <Thomas.Weichle@va.gov>
>> An: statalist@hsphsun2.harvard.edu
>> Betreff: 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
>>
>> *
>> *   For searches and help try:
>> *   http://www.stata.com/help.cgi?search
>> *   http://www.stata.com/support/statalist/faq
>> *   http://www.ats.ucla.edu/stat/stata/
>
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>

*
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