Plotting Kaplan Meier overall survival and group survival curves on the same graph.

[Ike Njere]

Hi all,

I would like to get some help. I am plotting a Kaplan Meier survival curve for some patients with oesophageal cancer. It is easy for me to plot the overall survival curve using the "Sts graph" command. I can also plot the survival curve for the different stages(0,1,2,3) using the "Sts graph, by(stage)" command. I am trying to put the Kaplan Meier survival curves for the overall survival and the survival by stages on the same graph to enable me compare the survival of each stage of disease to overall survival but I do not know how to do this on Stata. I would be grateful to obtain some assistance with this.
Thanks

Ike

[Andrew Musau]

A technique often expounded here on Statalist for creating an overall category is to duplicate each observation.

webuse drug2b, clear
set scheme s1color
sts graph, by(drug) saving(gr1, replace) leg(order(1 "placebo" 2 "drug")  col(1) pos(1) region(lstyle(none)) ring(0))
expand 2, gen(new)
replace drug=3 if new
sts graph, by(drug) saving(gr2, replace) leg(order(1 "placebo" 2 "drug" 3 "Both" ) col(1) pos(1) region(lstyle(none)) ring(0))
gr combine gr1.gph gr2.gph