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exact2x2  

Exact Tests and Confidence Intervals for 2x2 Tables
View on CRAN: Click here


Download and install exact2x2 package within the R console
Install from CRAN:
install.packages("exact2x2")

Install from Github:
library("remotes")
install_github("cran/exact2x2")

Install by package version:
library("remotes")
install_version("exact2x2", "1.7.0")



Attach the package and use:
library("exact2x2")
Maintained by
Michael P. Fay
[Scholar Profile | Author Map]
All associated links for this package
First Published: 2009-07-22
Latest Update: 2025-09-03
Description:
Calculates conditional exact tests (Fisher's exact test, Blaker's exact test, or exact McNemar's test) and unconditional exact tests (including score-based tests on differences in proportions, ratios of proportions, and odds ratios, and Boshcloo's test) with appropriate matching confidence intervals, and provides power and sample size calculations. Gives melded confidence intervals for the binomial case (Fay, et al, 2015, ). Gives boundary-optimized rejection region test (Gabriel, et al, 2018, ), an unconditional exact test for the situation where the controls are all expected to fail. Gives confidence intervals compatible with exact McNemar's or sign tests (Fay and Lumbard, 2021, ). For review of these kinds of exact tests see Fay and Hunsberger (2021, ).
How to cite:
Michael P. Fay (2009). exact2x2: Exact Tests and Confidence Intervals for 2x2 Tables. R package version 1.7.0, https://cran.r-project.org/web/packages/exact2x2. Accessed 18 Sep. 2026.
Previous versions and publish date:
(2026-07-09 07:36), 0.9-1 (2009-07-22 14:45), 0.9-3.1 (2009-08-14 22:24), 1.0-0 (2010-01-27 11:51), 1.0-1.1 (2010-07-30 17:58), 1.0-1 (2010-05-27 17:36), 1.1-0.0 (2010-10-06 08:30), 1.1-1.0 (2011-04-24 08:07), 1.2-0.0 (2014-03-05 22:54), 1.3.0 (2014-04-30 22:25), 1.4.0 (2014-08-25 16:14), 1.4.1 (2015-02-26 16:50), 1.5.2 (2017-02-16 22:40), 1.6.2 (2018-02-26 23:11), 1.6.3.1 (2019-10-16 21:00), 1.6.3 (2018-07-27 23:50), 1.6.4.1 (2020-06-30 22:20), 1.6.5 (2020-08-03 08:30), 1.6.6 (2021-12-09 10:30), 1.6.8 (2023-02-09 16:10), 1.6.9 (2024-01-25 20:10)
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