This example should get you started
*-------------begin example--------------
sysuse cancer, clear
stset studytim, failure(died)
sts gen surv = s, by(drug)
sts gen survtot =s
twoway (line surv _t if drug==1, connect(J)) /*
*/ (line surv _t if drug==2, connect(J)) /*
*/ (line surv _t if drug==3, connect(J)) /*
*/ (line survtot _t, sort connect(J))
*-------------end example-----------------
HTH,
Maarten
-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands
visiting adress:
Buitenveldertselaan 3 (Metropolitan), room Z214
+31 20 5986715
http://home.fsw.vu.nl/m.buis/
-----------------------------------------
[email protected] wrote:
> How does one combine an overall survival function graph with a
> graph showing survival functions for 2 treatment groups?
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