I'm trying to compute sample size requirements for a binomial exact test.
 we want to show that the proportion is at least 90% assuming that it is
95%, with 80% power so any asymptotic approximations are out of the
questions.  I was planning on using binom.test to perform the simple test
against a prespecified value, but cannot find any functions for computing
sample size.  do any exist?

Thanks,
Andrew

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