[18845] in s-news-athena
[S] Sample size
daemon@ATHENA.MIT.EDU (Giovanni Parrinello)
Wed Aug 4 04:21:13 1999
Message-Id: <3.0.5.32.19990804101945.007d2ba0@bsmed.med.unibs.it>
Date: Wed, 04 Aug 1999 10:19:45 +0200
To: s-news@wubios.wustl.edu
From: Giovanni Parrinello <parrinel@bsmed.med.unibs.it>
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Thanks to Vicki ? and Frank Harrell who both supplied solutions
to my question. Here are the solutions:
Vicki ?
You might want to check out the web site
http://www.stat.uiowa.edu/~rlenth/Power/.
It's full of sample size and power information.
Good Lick
Vicki
--------------------
Frank Harrell answer :
In the Hmisc library you will find the spower function which is a
fairly general function to simulate power for complex designs
involving 2 treatments. You can specify a dropout function as a
function of time, a dropin function, and treatment effect function
(hazard ratio), an accrual function, etc. This provides a continuous
version of the Lakatos approach.
--------------------------------------------
Original Message
>Hi,
>Does anyone know how where can I find a function to calculate the Sample
size for a >Survival study with the Lakatos's approch?
>References:
>Lakatos:'Sample size based on the long-rank test in complex critical
trials' >Biometrics 44 1988.
>S-Plus 4.5 for Win95.
>I know that there is a Sas version colled 'SIZE', but I do not know to get
also it.
>Any help will be greatly appreciated.
>Giovanni Parrinello
dr. Giovanni Parrinello
Sezione di Statistica Medica
Dipartimento di Biotecnologie
Università di Brescia
Via Valsabbina, 19
25100, Brescia
Italy
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