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0.05396969
2003 Apr 18
2
prop.test confidence intervals (PR#2794)
...example, I include x=6 and n=42 which has a mean proportion of 0.115.
When I calculate the 95% CI using the normal approximation by hand (and no
continuity correction) I get (0.028, 0.202). The exact binomial CI from
binom.test() is (0.044, 0.234). With correct=FALSE prop.test produces CI95 =
(0.05396969, 0.22971664) which is neither of these. With correct=TRUE it
produces (0.04778925, 0.2412937) This seems reasonably like a normal
approximation 95% CI (which I presume is what is used by prop.test()) of the
true binomial but I did not actually check it by hand.
BUG summary. The prop.test() calc...