I'll throw in a more recent citation: Chi-squared and Fisher-Irwin tests of two-by-two tables with small sample recommendations Stat in Med 26:3661-3675; 2007 http://www3.interscience.wiley.com/cgi-bin/abstract/114125487/ABSTRACT
to which Frank Harrell has offered some comments here (bottom of page): http://biostat.mc.vanderbilt.edu/twiki/bin/view/Main/DataAnalysisDisc HTH, Marc Schwartz On Tue, 2007-09-18 at 11:08 -0700, Cody Hamilton wrote: > Daniel, > > With regards to the use of Fisher's exact test when cell counts are > less than 5, take a look at: > > D'Agostino, RB, Chase, W and Belanger, A (1988). 'The appropriateness > of some common procedures for testing the equality of two independent > binomial populations.' 42:198-202. > > Regards, > -Cody > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Daniel Brewer > Sent: Tuesday, September 18, 2007 9:42 AM > To: [EMAIL PROTECTED] > Subject: [R] Cox regression and p-values > > Hello, > I might be barking up the wrong tree here, but I want to make sure I > have a full understanding of this. What I would like to know is what > tests are performed to give the p-values for each variable in the table > that is the result of coxph regression when the variables are > categorical only. > > More specifically, when expected counts are less than 5 is the Fisher's > exact test used instead of the Chi^2 test? > > Many thanks > Dan ______________________________________________ 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.
