After I shared comments form the forum yesterday with the biostatistician he indicated this:
"Fisher's exact test is the non-parametric analog for the Chi-square test for 2x2 comparisons. A version (or extension) of the Fisher's Exact test, known as the Freeman-Halton test applies to comparisons for tables greater than 2x2. SAS can calculate both statistics using the following instructions. proc freq; tables a * b / fisher;" Do people here still stand by position fisher exact test can be used for RxC contingency tables ? Sorry to both you all so much it is just important for a paper I am writing and planning to submit soon. ( I have a 4x2 table but does not meet expected frequencies requirements for chi-squared.) I guess people here have suggested R implements, the following, which unfortunately are unavailable at least easily at my library but at least by the titles indicates it is extending it to RxC Mehta CR, Patel NR. A network algorithm for performing Fisher's exact test in r c contingency tables. Journal of the American Statistical Association 1983;78:427-34. Mehta CR, Patel NR. Algorithm 643: FEXACT: A FORTRAN subroutine for Fisher's exact test on unordered r x c contingency tables. ACM Transactions on Mathematical Software 1986;12:154-61. The only reason I ask again is he is exceptionally clear on this point. Thanks again, -Rob viostorm wrote: > > Thank you all very kindly for your help. > > -Rob > > -------------------------------- > Robert Schutt III, MD, MCS > Resident - Department of Internal Medicine > University of Virginia, Charlottesville, Virginia > viostorm wrote: > > Thank you all very kindly for your help. > > -Rob > > -------------------------------- > Robert Schutt III, MD, MCS > Resident - Department of Internal Medicine > University of Virginia, Charlottesville, Virginia > -- View this message in context: http://r.789695.n4.nabble.com/fisher-exact-for-2x2-table-tp3481979p3484009.html Sent from the R help mailing list archive at Nabble.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.
