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st: Need Help regarding sorting

From   Michael Stewart <>
To   statalist <>
Subject   st: Need Help regarding sorting
Date   Mon, 4 Mar 2013 14:43:33 -0500

I am working on a  health care  database and  am trying to weed out duplicates

My data  is as follows

Patientname   date_of_event type
xxxx   1/1/2010   HP
xxxx   1/2//2010 DS
xxxx   1/3/2010 DS
xxxx  1/5/2010  HP
xxxx  1/6//2010  DS
yyyy   1/4/2011  HP
yyyy  1/5/2011 DS

Here in this dataset DS refers to discharge summary and HP refers to
history and physical

I am specifically trying to find out for each patient: if  two DS are
separated by a HP

Thanks a lot

Thank you ,
Yours Sincerely,
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