Not quite.
When you -tab-, you are counting
legs, and the question is about individuals.
Note also that with the now undocumented -by()-
option, a prior -sort- is not needed.
Still, the use of -egen- here is simpler than
my solution in another posting.
Nick
[email protected]
Earnhart, Benjamin J
> sort id
> egen numuc=sum(vi), by(id)
> tab numuc
Raphael Fraser
> > 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
> >
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