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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 15:16:44 +1030

Michael

The placement() suboption's arguments (ne, se etc) are relative to the
_point_ you nominate as the #y #x arguments of the main text() option.  In
this case we had   text(.05  5...)  and the placement was  ne , so the box
was sited to the northeast (above and to the right) of of the point defined
by y=0.05 and x=5.

If you want the text box elsewhere, you will need to change the #y and #x
specs.

As far as box size is concerned:

sysuse cancer.dta, clear
stset studytime
drop if drug==3
sts test drug
local chi_P  logrank P = `=round(chi2tail(r(df),r(chi2)), .01)'
sts graph, by(drug) risktable text(.05 5 "`chi_P'", place(ne) box
size(small) col(red) width(80) height(40))


... though admittedly more care with the height() and width() option might
be warranted.

Phil

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Michael McCulloch
Sent: Friday, 12 February 2010 2:59 PM
To: statalist@hsphsun2.harvard.edu
Subject: Re: sts test: displaying log-rank test of equality within a Kaplan
Meier graph

Thanks Phillip! This gives me the idea. May I ask:
	* regardless of what place option I use: ne, se, nw, sw, etc., they

all put the text box in the lower left corner. I've read -help  
compassdirstyle- and
	* bexpand also doesn't expand the size of the box.
Michael


On Feb 11, 2010, at 8:05 PM, Philip Ryan wrote:

> Michael
>
> I note you wanted a "window".  Here is a box instead. I also correct  
> my
> misuse of the return scalars :-(
>
>
> sysuse cancer.dta, clear
> stset studytime
> drop if drug==3
> sts test drug
> local chi_P  logrank P = `=round(chi2tail(r(df),r(chi2)), .01)'
> sts graph, by(drug) risktable text(.05 5 "`chi_P'", place(ne) box
> size(small) col(red))
>
>
>
> Philip Ryan
> 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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>
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> *   http://www.ats.ucla.edu/stat/stata/


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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