st: combining several Kaplan Meier graphs

[Michael McCulloch <mm@pinest.org>]

Dear Statalist members,
I have four separate KM graphs which I'd like to combine into one, 
arranged in a four-square layout. Any pointers would be greatly 
appreciated. The syntax is as follows:

sts graph if stage==1, by(tx)  ///
	title("Survival, stage II NSCLC", box bfcolor(white)) ///
	caption("tx=0: Did not use therapy;   tx=1: used therapy") ///
	lpattern(-) xtitle("Survival time in months") 
l2title("Percent surviving") xmtick(0(10)150)

sts graph if stage==3, by(tx) ///
	title("Survival, stage II NSCLC", box bfcolor(white)) ///
	caption("tx=0: Did not use therapy;   tx=1: used therapy") ///
	lpattern(-) xtitle("Survival time in months") 
l2title("Percent surviving") xmtick(0(10)150)

sts graph if stage==4, by(tx) ///
	title("Survival, stage IIIB NSCLC", box bfcolor(white)) ///
	caption("tx=0: Did not use therapy;   tx=1: used therapy") ///
	lpattern(-) xtitle("Survival time in months") 
l2title("Percent surviving") xmtick(0(10)150)

sts graph if stage==5, by(tx) ///
	title("Survival, stage IV NSCLC", box bfcolor(white)) ///
	caption("tx=0: Did not use therapy;   tx=1: used therapy") ///
	lpattern(-) xtitle("Survival time in months") 
l2title("Percent surviving") xmtick(0(10)150)
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