Hello,
Does anyone know which method from Newcombe (1998)* is implemented in prop.test
for comparing two proportions?
I would guess it is the method based on the Wilson score (for single
proportion), with and without continuity correction for prop.test(...,
correct=FALSE) and prop.test(..., correct=TRUE). These methods would correspond
to no. 10 and 11 tested in Newcombe, respectively. Can someone confirm this? If
not, which other methods are implemented by prop.test?
* Newcombe R.G. (1998) Two-Sided Confidence Intervals for the Single
Proportion: Comparison of Seven Methods. Statistics in Medicine *17*, 857-872.
There is also the function ci.pd() from the R-package Epi, which should
implement method no. 10 from Newcombe. However, prop.test(..., correct=FALSE)
and ci.pd do not give the same result if I do the following:
successes <- c(21, 41)
total <- c(345, 345)
prop.test(successes, total, correct=FALSE)
library(Epi)
ci.pd(matrix(c(successes, total-successes),ncol=2, byrow=TRUE))
Can someone explain why?
Best wishes
Stefanie von Felten
Stefanie von Felten, PhD
Statistician
Clinical Trial Unit, CTU
University Hospital Basel
Schanzenstrasse 55
CH-4031 Basel
Phone: ++41(0)61 556 54 98
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
