exact2x2

1.7.0

Exact Tests and Confidence Intervals for 2x2 Tables

7packages depend

45.7Kdownloads / year

20.0%test coverage

13/13checks pass

Overview

About

Maintained by Michael P. FayFirst published 2009-07-2221 releasesCRAN page ↗

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, DOI:10.1111/biom.12231). Gives boundary-optimized rejection region test (Gabriel, et al, 2018, DOI:10.1002/sim.7579), 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, DOI:10.1002/sim.8829). For review of these kinds of exact tests see Fay and Hunsberger (2021, DOI:10.1214/21-SS131).

Install

R (CRAN)Ubuntu (r2u)Fedora (COPR)openSUSE (OBS)

install.packages("exact2x2", repos = "https://cloud.r-project.org/")

Installs the current CRAN release. Prebuilt binaries on Windows and macOS.

Release

# enable cranapt (r2u) if it is not already set up, then install
grep -rqs r2u.stat.illinois.edu /etc/apt/sources.list /etc/apt/sources.list.d/ \
  || curl -fsSL https://raw.githubusercontent.com/eddelbuettel/r2u/master/inst/scripts/add_cranapt_noble.sh | sudo bash
sudo apt install -y r-cran-exact2x2

Fast Ubuntu binaries via r2u (no compilation). The cranapt setup runs once and is skipped when it is already enabled.

bspm (used by r2u) also needs make: sudo apt install make

# enable the iucar/cran COPR if it is not already present, then install
ls /etc/yum.repos.d/*iucar*cran*.repo >/dev/null 2>&1 \
  || sudo dnf copr enable -y iucar/cran
sudo dnf install -y R-CRAN-exact2x2

RPMs from the iucar/cran COPR, rebuilt from CRAN.

For install.packages() integration in R, also: sudo dnf install R-CoprManager

# add the autoCRAN OBS repo (Tumbleweed) if it is missing, then install
zypper -q lr | grep -qi autoCRAN \
  || sudo zypper addrepo https://download.opensuse.org/repositories/devel:/languages:/R:/autoCRAN/openSUSE_Tumbleweed/devel:languages:R:autoCRAN.repo
sudo zypper install -y R-exact2x2

RPMs auto-built from CRAN on openSUSE OBS (Tumbleweed).

Health

CRAN checks

13OK

Slowest check: 2.8 min · r-oldrel-windows-x86_64

Code health

Yes

Tests · ratio 0.06

20.0%

Coverage · measured lines

100%

Documentation · exports

Dependencies · direct

Check history

OK2026-06-09
13 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
ERROR2026-06-08
12 OK · 0 NOTE · 0 WARNING · 1 ERROR · 0 FAILURE
OK2026-03-10
14 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE

Documentation

READMENoVignettesYes · dynamicpkgdown siteNoNEWSNoCode of conductNoContributing guideNo

Examples that run: 95%
Documented parameters: 97%
Return-value docs: 95%
References docs: 100%

Downloads

45.7K

CRAN downloads in the past year

Rank #2,621 · ~125/day · ~3.8K/mo

Releases R versions

Daily download trend is not available in this view yet.

2K30 days

7.6K90 days

45.7K1 year

Compare downloads with other packages →

Also on144 r2u38 autocran2.4K conda_forge

Dependencies

Declared dependencies

6 external dependencies (excludes base and recommended)

Depends (4)

R >= 2.10statsexactci ssanv

Imports (0)

none

LinkingTo (0)

none

Suggests (5)

testthat Exact ggplot2gridgridExtra

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

7direct

1indirect

asht pCalibrate vvdoctor bbssr bpcp exactci jmv

Code & Tests

People & History

People (5)

Maintainer (1)

Michael P. Fay

Author, Maintainer · added in 1.2-0.0

Authors (1)

Michael P. Fay

Author, Maintainer · added in 1.2-0.0

Contributors (4)

Erin Gabriel

Contributor · added in 1.6.2

Sally A. Hunsberger

Contributor · added in 1.5.2

Keith Lumbard

Contributor · added in 1.6.4.1

Martha Nason

Contributor · added in 1.6.2

Listed in earlier versions (3)

M.P. Fay

no longer listed · 0.9-1 to 1.1-1.0

Fay

no longer listed · 1.7.0

Hunsberger

no longer listed · 1.7.0

Package Timeline

21 releases. Pick two to compare their code metrics. R releases are shown for context.

R
R 4.6.0 released · 2026-04-24
1.7.0Latest
2025-08-20 · current release · diff ↗
R
R 4.5.0 released · 2025-04-11
R
R 4.4.0 released · 2024-04-24
1.6.9
2024-01-25 · diff ↗
R
R 4.3.0 released · 2023-04-21
1.6.8
2023-02-09 · diff ↗
R
R 4.2.0 released · 2022-04-22
1.6.6
2021-12-09 · diff ↗
R
R 4.1.0 released · 2021-05-18
1.6.5
2020-08-03 · diff ↗
1.6.4.1
2020-06-30 · diff ↗
R
R 4.0.0 released · 2020-04-24
1.6.3.1
2019-10-16 · diff ↗
R
R 3.6.0 released · 2019-04-26
1.6.3
2018-07-27 · diff ↗

Show 26 earlier events

R
R 3.5.0 released · 2018-04-23
1.6.2
2018-02-26 · diff ↗
R
R 3.4.0 released · 2017-04-21
1.5.2
2017-02-16 · diff ↗
R
R 3.3.0 released · 2016-05-03
R
R 3.2.0 released · 2015-04-16
1.4.1
2015-02-26 · diff ↗
1.4.0
2014-08-25 · diff ↗
1.3.0
2014-04-30 · diff ↗
R
R 3.1.0 released · 2014-04-10
1.2-0.0
2014-03-05 · diff ↗
R
R 3.0.0 released · 2013-04-03
R
R 2.15.0 released · 2012-03-30
R
R 2.14.0 released · 2011-10-31
1.1-1.0
2011-04-24 · diff ↗
R
R 2.13.0 released · 2011-04-13
R
R 2.12.0 released · 2010-10-15
1.1-0.0
2010-10-06 · diff ↗
1.0-1.1
2010-07-30 · diff ↗
1.0-1
2010-05-27 · diff ↗
R
R 2.11.0 released · 2010-04-22
1.0-0
2010-01-27 · diff ↗
R
R 2.10.0 released · 2009-10-26
0.9-3.1
2009-08-14 · diff ↗
0.9-1
2009-07-22
R
R 2.9.0 released · 2009-04-17

Package metadata

First published: 2009-07-22
Total releases: 21 / 17 yrs
License: GPL-3 OSI
Minimum R: ≥ 2.10
Download size: 844 KB
Installed size: not tracked yet
With dependencies: not tracked yet

Report a problem with this page →