--- On Mon, 8/6/09, Ricardo Ovaldia wrote:
> I have been asked to plot Kaplan-Meier curves adjusted for
> covariates, such as age, gender, race.
> My thought was to use -stcox- to adjust and then plot the
> adjusted survival using -stcurve-.
> But I am not sure I am doing this correctly. The KM curves
> plotted with -sts graph,by()- crossover, but those plotted
> with -stcurve- do not and also they have a lot more steps
> than the original curves. Any ideas?
Sounds like a reasonable strategy to me. I don't have any
concrete ideas, except that I added the example below of
how I would do this. Maybe you can see something in my
example that is different from what you did (no guarantees
that what did is better than what you did though).
*--------- begin example --------
sysuse cancer, clear
stset studytime, failure(died)
xi: stcox i.drug age, basesurv(S)
stcurve, survival
*--------- end example ----------
Hope this helps,
Maarten
-----------------------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany
http://home.fsw.vu.nl/m.buis/
-----------------------------------------
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