"or an incompetent" Such harsh words Peter. You're not making this a friendly environment for people to ask questions. Is there a less competent attribute mailing list so that some of us don't offend you with our questions?
On Aug 13, 2010, at 2:11 PM, Peter Dalgaard wrote: Andrea Franceschini wrote: > I ask the question also because I found this line in Wikipedia: > "The test (see above) based on the hypergeometric distribution > (hypergeometric test) is identical to the corresponding one-tailed > version of Fisher's exact test". > > Is this wrong ? May I kindly ask a friendly explanation for > not-experts in statistics ? > > Thx a lot, > You never said you were a non-expert. A question like that might very well have come from a student, or an incompetent claiming to have found a bug in fisher.test... The point was that Fisher's test takes the 2x2 table a b c d and interprets the situation under the null hypothesis as taking a sample of size a+c from an urn with a+b white balls and c+d black balls. Once you read the docs for phyper properly (it _is_ tricky to get it right), you arrive at > phyper(16,17+181,449+19551,17+449, lower.tail=FALSE) [1] 3.693347e-06 -- Peter Dalgaard Center for Statistics, Copenhagen Business School Phone: (+45)38153501 Email: pd....@cbs.dk Priv: pda...@gmail.com ______________________________________________ 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. ______________________________________________ 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.