One of the joys of R is that it's open source: you can read the code for prop.test yourself and see what's happening.
In this case, simply typing prop.test at the command line will provide it, although without comments. Sarah On Wed, Apr 3, 2013 at 6:10 PM, David Arnold <dwarnol...@suddenlink.net> wrote: > Hi, > > This code: > > n=40 > x=17 > phat=x/n > SE=sqrt(phat*(1-phat)/n) > zstar=qnorm(0.995) > E=zstar*SE > phat+c(-E,E) > > Gives this result: > > [1] 0.2236668 0.6263332 > > The TI Graphing calculator gives the same result. > > Whereas this test: > > prop.test(x,n,conf.level=0.99,correct=FALSE) > > Give this result: > > 0.2489036 0.6224374 > > I'm wondering why there is a difference. > > D. > > -- Sarah Goslee http://www.functionaldiversity.org ______________________________________________ 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.
