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st: RE: Tips for writing code to consolidate observations?


From   "David Radwin" <dradwin@mprinc.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Tips for writing code to consolidate observations?
Date   Tue, 13 Nov 2012 13:28:04 -0800 (PST)

Like this?

bysort ID (GCS): keep if _n==1

David
--
David Radwin
Senior Research Associate
MPR Associates, Inc.
2150 Shattuck Ave., Suite 800
Berkeley, CA 94704
Phone: 510-849-4942
Fax: 510-849-0794

www.mprinc.com


> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-
> statalist@hsphsun2.harvard.edu] On Behalf Of David
> Sent: Tuesday, November 13, 2012 1:00 PM
> To: statalist@hsphsun2.harvard.edu
> Subject: st: Tips for writing code to consolidate observations?
> 
> I have a large dataset that has multiple observations per individual
> and need to convert to single line observations (9,000 lines rows but
> really only a few hundred subjects).  The data columns that account
> for the multiple observations are unnecessary (see below, e.g.,
> ICD-9).  The first occurrence of the data that I need to capture is
> the first time the observation occurs.  As there are about 500
> subjects, I was hoping there is some code to convert to single
> observations/line.  See the example below of what I have and what I
> would like it to look like.
> 
> 
> (RAW DATA)
> 
> ID   ICD-9     GCS  AIS1 AIS2 AIS3 AIS4 AIS5 AIS6
> 
> 1    823.2     15         0      1       1       1      0      0
> 1    849.5
> 1    823.5
> 2    849.1     12         0      1       3       3      2      1
> 3    813.4     11         0      0       3       3      7      7
> 3    775.1
> 
> 
> (IDEAL Final Product)
> 
> ID   GCS  AIS1 AIS2 AIS3 AIS4 AIS5 AIS6
> 
> 1      15      0      1       1       1      0      0
> 2      12      0      1       3       3      2      1
> 3      11      0      0       3       3      7      7
> 
> 
> Much appreciated,
> 
> David Zonies, MD MPH
> Landstuhl Regional Medical Center
> Landstuhl, Germany

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