Giulio Rizzoli
> > I have stata7.
> > I have this table with the yearly frequence of use of the
> variable drug= 1
> > or 2 or 3 (labelled AA BB CC)
> > .label value drug drugf
> > .table opy drug
> > year AA BB CC
> > ____________________
> > 1970 8
> > 1971 4
> > 1973 1
> > 1997 1 56
> > 1998 65
> > 1999 24
> > 2000 1 5
> > 2001 20
> > 2002 36
> > _________________________
> >
> > Question: how can I produce a line plot of the frequences
> of AA BB CC
> > across years with a different line for each ?
Ulrich Kohler
>
> What about:
>
> . contract year drug, freq(n)
> . separate n, by(drug)
> . graph n1 n2 n3 year, c(lll) sort
>
> (not tested)
Note that this would overwrite the current data
set, so -save- it first if necessary.
The -zero- option of contract may also
be useful.
Nick
[email protected]
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