Re: st: sample size calculation for survival data

[Philip Ryan <philip.ryan@adelaide.edu.au>]

For sample size and power estimations for survival data analysis you might 
try Barthel, Royston and Babiker's "ART" suite of programs.  The -artsurv- 
program provides more flexibility than -sampsi- for some of the trickier 
design features of studies involving survival analysis.  See:

SJ-5-1  st0013_1  . Sample size calculation: Update
        . . . . . . . . . . .F. M.-S. Barthel, P. Royston & A. Babiker
        (help artbin, artbindlg, artmenu, artprep, artsurv, artsurvdlg, 
artwhastsnew if installed)
        Q1/05   SJ 5(1):123--129
        an update to a menu-driven front end for complex sample size
        calculation in randomized controlled trials with a survival
        or a binary outcome; renamed ART

The help file is good, but access to the original article in SJ 2-2 is 
recommended.

Phil



At 06:06 PM 6/03/2007 +0100, you wrote:

> Dear all,
>
> Does anybody know how to calculate sample size in the following
> situation with Stata?
>
> H0: s1=s2 (survival at 2 years) H1: one side (logrank non paramentric
> test for exponential data)
> Size ratio =1
> S1=77,5%, s2=83,125%
> Alfa=5%
> Beta=20%
> Lost follow-up 10% per year
> Accrual time =2 years
> Total study time =4 years (2 enrollment+2 follow-up)
>
> I would like to perform this analysis with Stata but the manual doesn't
> describe it.
> Could you help me please?
> Thanks a lot
> Paola
>
>
>
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Philip Ryan
Associate Professor,
Discipline of Public Health

Director, Data Management & Analysis Centre

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