[EpiData-list] (no subject)

epidata-list at lists.umanitoba.ca epidata-list at lists.umanitoba.ca
Mon Sep 29 07:41:17 CDT 2014

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)



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