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st: sample size

From   "Kazi Mizanur Rahman" <[email protected]>
To   <[email protected]>
Subject   st: sample size
Date   Thu, 6 Jan 2005 09:31:45 +0600

The baseline proportion of a an event was 0.9.
We assume that after providing an intervention in one group for a particular
time period we get the proportion as 0.5. We also have a comparison group
that receives no intervention. After that particular time period the
proportion becomes 0.8 in the comparison group. How to calculate the sample
size with 80% power and alpha .05 ?


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