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.