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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