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epidata-list at lists.umanitoba.ca epidata-list at lists.umanitoba.ca
Mon Sep 29 08:56:52 CDT 2014


Hi.
I cannot give you the comand syntax in epidata (maybe in Stata) but what
you could simply do is the following:
Create a variable first_visit_date = min(visit_date) by (id_unique)
select where visit_date = firs_visit_date.

Serge

2014-09-29 14:41 GMT+02:00 <epidata-list at lists.umanitoba.ca>:

> Dear ALL,
>
> I have a data set where some patients have more than one entry (visit) i.e.
> same patient with different visit dates, while some have only one entry
> (visit). I would like to select only the first visit from each patient (The
> variables to use are  id_unique and visit_date)
>
> Regards
>
> Walter
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> EpiData-list mailing list
> EpiData-list at lists.umanitoba.ca
> http://lists.umanitoba.ca/mailman/listinfo/epidata-list
>



-- 
*M. Aymar Serge SOMDA, BEng. MMath. MSPH.*
            *Méthodologiste - Biostatisticien*
*
Chef Unité de Formation et d'Appui Méthodologique
Centre MURAZ
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Email: serge.somda at centre-muraz.bf
http://www.centre-muraz.bf/

Cellule de Biostatistique
Institut Universitaire du Cancer
Toulouse - Oncopole
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Toulouse, France
Email: somda.serge at iuct-oncopole.fr
http://www.oncopole-toulouse.com/

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