sort id
egen numuc=sum(vi), by(id)
tab numuc
*==========================================;
*Ben Earnhart
*Computer Consultant and
*ICPSR Representative
*Department of Sociology and
*College of Liberal Arts
*University of Iowa
*(319) 335-2887
*benjamin-earnhart@uiowa.edu
*==========================================;
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of
> Raphael Fraser
> Sent: Thursday, September 07, 2006 4:14 PM
> To: statalist@hsphsun2.harvard.edu
> Subject: st: Counting Ulcers
>
> Below is a snippet of my data. Each subject has 2 observation where vi
> indicates whether an ulcer is present or not. I would like to count
> the number of patients with ulcers on one leg only and those with
> ulcers on both legs.
> left=1, right=0
>
> id leg vi
> 40 right .
> 40 left .
> 46 right 1
> 46 left 1
> 47 left 0
> 47 right 1
> 48 right .
> 48 left .
> 55 left 1
> 55 right 1
> 57 right 0
> 57 left 1
>
> Raphael
> *
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> * http://www.ats.ucla.edu/stat/stata/
>
*
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