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st: RE: Sample size calculation


From   "Vivian Goodell" <vgoodell@u.washington.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Sample size calculation
Date   Wed, 26 Oct 2005 08:34:38 -0700

Don't know if this would help, but we do PASS calcs for new tumor
markers like this: Set power and alpha at something reasonable
(reasonable to review boards, usually 80% and 0.05)and create a graph
showing a range of sample sizes plotted against a range of effect sizes.


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of
slaowattana@pol.net
Sent: Wednesday, October 26, 2005 6:19 AM
To: statalist@hsphsun2.harvard.edu
Subject: st: Sample size calculation

We are planning to measure some cytokines in patients with MS comparing
between a group with treatment and control, but there have not been
literatures regarding these measurements, so we do not have an estimated
mean and standard deviation. Is there a way to estimate a sample size?
(our IRB really wants to see sample size estimate.) Thanks.


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