Thank you, Maarten, that worked very well. Problem solved!
Patrick
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Maarten Buis
Sent: 11 January 2007 17:17
To: [email protected]
Subject: st: RE: sts graph by option and totals[Scanned]
--- Patrick Woodburn asked:
> Is there any way to plot a survival plot across a total dataset on the
> same graph as survival time plots divided across the values of a
> particular variable?
You can use -sts gen- to create variables containing the values of the
survival functions, and then graph those, like in the example below:
Hope this helps,
Maarten
*----------- begin example ----------
sysuse cancer, clear
stset studytime, failure(died)
sts gen tsurv = s
sts gen bsurv = s, by(drug)
twoway line bsurv _t if drug==1, sort || /*
*/ line bsurv _t if drug==2, sort || /*
*/ line bsurv _t if drug==3, sort || /*
*/ line tsurv _t, sort /*
*/ xtitle("analysis time") /*
*/ ytitle("") /*
*/ title("Kaplan-Meier survival estimates") /*
*/ legend(label(1 "placebo") /*
*/ label(2 "drug 2" ) /*
*/ label(3 "drug 3" ) /*
*/ label(4 "total" ) )
*------------- end example ----------
-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands
visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434
+31 20 5986715
http://home.fsw.vu.nl/m.buis/
-----------------------------------------
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