Hi,
I am trying to do a power calculation for a difference in proportions
test where I want to estimate the sample size required. I know (well
estimate) that group one (n1) is 10% of the population and group 2 (n2)
is 90% of the population. I know the effect size (h). pwr.2p2n.test
only allows one variable to be left null whereas I would like both n1
and n2 to be determined where I know there relative proportions. Any
ideas how to do this? Is there a different function?
Thanks
Dan
--
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Daniel Brewer, Ph.D.
Institute of Cancer Research
Molecular Carcinogenesis
Email: [EMAIL PROTECTED]
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The Institute of Cancer Research: Royal Cancer Hospital, a charitable Company
Limited by Guarantee, Registered in England under Company No. 534147 with its
Registered Office at 123 Old Brompton Road, London SW7 3RP.
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