Re: st: Re: Kaplan Meier plot: adding vertical line at median survival

[Michael McCulloch <mm@pinest.org>]

Thanks Martin! This works splendidly. May I ask: the legend adds 
another group entitled "y/yb", which seems to refer to the vertical 
lines created. Is there a way to suppress this?
Michael

> You could also automate some of your calculations:
>
> **********
> sysuse cancer.dta, clear
> stset studytime
> levelsof(drug), loc(levdrug)
> foreach lev of loc levdrug{
> _pctile studytime if drug==`lev'
> loc a`lev'=r(r1)
> }
> sts graph, by(drug) addplot((pci -0.035 `a1' 0.5 `a1' -0.035 `a2' 
> 0.5 `a2' -0.035 `a3' 0.5 `a3', lcolor(black))) yline(0.5, 
> lpattern(dash))
> **********
>
> HTH
> Martin
> _______________________
> ----- Original Message ----- From: "Michael McCulloch" <mm@pinest.org>
> To: "Statalist" <statalist@hsphsun2.harvard.edu>
> Sent: Sunday, November 02, 2008 4:04 AM
> Subject: st: Kaplan Meier plot: adding vertical line at median survival
>
> > Greetings,
> > I'd like to plot a Kaplan Meier graph with a vertical line at the 
> > point of median survival, where the line begins at the x-axis and 
> > ends at the point where that vertical line intersects the survival 
> > curve.
> >
> > For example:
> > sysuse cancer.dta
> > stset studytime
> > sts graph, by(drug)
> >
> > In this example, for drug2 median survival is at 13 months, and for 
> > drug3, at 25 months, so I'd .
> > Is this possible within the -sts graph- command? I'm using v9.2 and 
> > so don't have the manual graphical editing features of v10.
> >
> > Thank you.
> >
> > --
> >
> > Best wishes,
> > Michael McCulloch
> >
> >
> >
> > Pine Street Foundation
> > 124 Pine St., San Anselmo, CA 94960-2674
> > Tel: (415) 407-1357
> > Fax: (415) 485-1065
> > mcculloch@pinestreetfoundation.org
> > www.pinestreetfoundation.org
> > *
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>
>
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