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st: RE: RE: Counting Ulcers


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: RE: Counting Ulcers
Date   Thu, 7 Sep 2006 22:48:53 +0100

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 
n.j.cox@durham.ac.uk 

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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