Karl Knoblick wrote:
Hallo!

Does anybody know how to calculate a sample size estimation for proportions 
with continuity correction?

That would lose power.

Frank

I only found EpiR which seems to calculate without continuity correction:

library(epiR)
epi.studysize(treat = .65, control = .50, n = NA, sigma = NA,
power = 0.80, r = 1, conf.level = 0.95, sided.test = 2, method = "cohort")
$n
[1] 340


Thanks!
Karl





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Frank E Harrell Jr   Professor and Chair           School of Medicine
                     Department of Biostatistics   Vanderbilt University

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