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RE: sts test: displaying log-rank test of equality within a Kaplan Meier graph


From   "Philip Ryan" <philip.ryan@adelaide.edu.au>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: sts test: displaying log-rank test of equality within a Kaplan Meier graph
Date   Fri, 12 Feb 2010 14:25:21 +1030

You could tinker with something like this:

sysuse cancer.dta, clear
stset studytime
drop if drug==3
sts test drug
local chi_res  logrank P = `=round(r(chi2), .01)' 
sts graph, by(drug) risktable text(.05 5 "`chi_res'", place(ne) size(small)
col(red))


Phil


Philip Ryan
Professor and Director
Data Management & Analysis Centre
University of Adelaide 


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Michael McCulloch
Sent: Friday, 12 February 2010 1:23 PM
To: Statalist Statalist
Subject: sts test: displaying log-rank test of equality within a Kaplan
Meier graph

Dear Statalist members,
I'm creating a Kaplan-Meier graph, and also performing the log-rank  
test of equality, for example:

sysuse cancer.dta, clear
stset studytime
drop if drug==3
sts graph, by(drug) risktable
sts test drug

My question: is it possible to display the results of the log-rank  
test in a small window within the area of the Kaplan-Meier survival  
curve?


Best wishes,

Michael McCulloch
Pine Street Foundation
124 Pine Street
San Anselmo, CA 94960-2674
tel:	415-407-1357
fax: 	206-338-2391

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