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st: combining two Kaplan Meier graphs, with only one legend


From   Michael McCulloch <mm@pinest.org>
To   Statalist <statalist@hsphsun2.harvard.edu>
Subject   st: combining two Kaplan Meier graphs, with only one legend
Date   Sun, 3 Aug 2008 10:12:09 -0700

Hello,
I'm seeking advice on how to combine two Kaplan Meier graphs, with only one legend. Using the hip2.dta dataset, I've created one KM graph where calcium is <10, and one where calcium is >10. I'd appreciate any suggestions on how to show:

(a) on each sub-graph:
the sub-titles
"Calcium<10"
"Calcium>=10"
the x-label "Survival time in months"

(b) on the combined graph only:
the legend " ___ Protected" and "---- Not protected"
a main title "Benefit of Protection Based on Calcium Level"


****** begin example *******
use hip2.dta, clear

* KM compare protect = yes to protect = no, where Calcium<10
sts graph if calcium<10, by(protect) title("Calcium<10", box bfcolor(white)) ///
saving("cal<10", replace ) legend(label(1 "Protected") label(2 "Not Protected")) ///
lpattern(l - dot _) lcolor(black black black black) xtitle("Survival time in months") l2title("Percent surviving") xmtick(0(10)40)

* KM compare protect = yes to protect = no, where Calcium>=10
sts graph if calcium>=10, by(protect) title("Calcium>=10", box bfcolor(white)) ///
saving("cal>=10", replace ) legend(label(1 "Protected") label(2 "Not Protected")) ///
lpattern(l - dot _) lcolor(black black black black) xtitle("Survival time in months") l2title("Percent surviving") xmtick(0(10)40)

* FIGURE 1: KM, all stages by stage, combined into one graph
graph combine cal<10.gph cal>=10.gph, saving("all_cal", replace ) rows(2) cols(2) iscale(0.5)
****** end example *******
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