Dear Nick:
Thank you for your kindness. Yes, you are right. I have a categorical
variable, say A, with 3 categories, A1, A2, A3. The idea was to plot the
means of the continuous variable haemoglobin over the values 0,1,2,3
..11 months of the numeric/continuous variable age. So, I would have
three curves of haemoglobin in the same plot/graph. In using -ciplot- I
would do it very fast if the command allowed that.
I will try the other ways.
Cheers,
Jose Maria
Nick Cox wrote:
I take this as a reference to the user-written
program -ciplot- on SSC.
>
-ciplot- is best thought of as a wrapper
for -ci-. It has a -by()- option, just
as -ci- does, and the design decision
was to allow several confidence intervals
to be shown in one plot.
That _isn't_ how -twoway ... , by()-
works; in other words, -ciplot- follows
-ci-, not -twoway-, in what -by()- means.
-ciplot- has a -plot()- option, which is
more evident from looking at the code
than from looking at the help,
As the whole point of -ciplot- is to draw
confidence intervals, I am somewhat bemused
by the option suggested. If you want
just to plot means, there are lots of ways
to do that.
Nick
[email protected]
--
Jose Maria Pacheco de Souza, Professor Titular
Departamento de Epidemiologia
Faculdade de Saude Publica/Universidade de Sao Paulo
Av. Dr. Arnaldo, 715 cep 01246-904
Sao Paulo Brasil
fones (11)3082-3886 (11)3714-2403 (11)3768-8612
fax (11)3082-2920 (11)3714-2403
www.fsp.usp.br/~jmpsouza
[email protected]
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