Do you mean a test something such as this? > fisher.test(matrix(c(502,498,490, 510), nrow = 2))
Fisher's Exact Test for Count Data data: matrix(c(502, 498, 490, 510), nrow = 2) p-value = 0.6228 alternative hypothesis: true odds ratio is not equal to 1 95 percent confidence interval: 0.8770113 1.2550998 sample estimates: odds ratio 1.049119 This runs quickly on my machine. > system.time(fisher.test(matrix(c(502,498,490, 510), nrow = 2))) user system elapsed 0.008 0.001 0.010 > sessionInfo() R version 2.12.2 (2011-02-25) Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit) locale: [1] en_CA.UTF-8/en_CA.UTF-8/C/C/en_CA.UTF-8/en_CA.UTF-8 attached base packages: [1] stats graphics grDevices utils datasets methods base loaded via a namespace (and not attached): [1] tools_2.12.2 > Can you provide an example that is running slowly for you? Steven McKinney ________________________________________ From: r-help-boun...@r-project.org [r-help-boun...@r-project.org] On Behalf Of Jim Silverton [jim.silver...@gmail.com] Sent: April 8, 2011 9:43 AM To: r-help@r-project.org Subject: Re: [R] Fast version of Fisher's Exact Test Is anyone aware of a fast way of doing fisher's exact test for a series of 2 x 2 tables in R? The fisher.test is really slow if n1=1000 and n2 = 1000. -- Thanks, Jim. [[alternative HTML version deleted]] ______________________________________________ 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.