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 Cody Hamilton Edwards Lifesciences -----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 -- ************************************************************** Daniel Brewer, Ph.D. Institute of Cancer Research Email: [EMAIL PROTECTED] ************************************************************** The Institute of Cancer Research: Royal Cancer Hospital, a charitable Company Limited by Guarantee, Registered in England under Company No. 534147 with its Registered Office at 123 Old Brompton Road, London SW7 3RP. This e-mail message is confidential and for use by the addre...{{dropped}} ______________________________________________ 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.
