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st: Counting Ulcers


From   "Raphael Fraser" <raphael.fraser@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Counting Ulcers
Date   Thu, 7 Sep 2006 16:14:10 -0500

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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