Analysis of Two-Way Tables R package twoway version 0.7.0 Carries out analyses of two-way tables with one observation per cell, together with graphical displays for an additive fit and a diagnostic plot for removable 'non-additivity' via a power transformation of the response. It implements methods from Tukey's Exploratory Data Analysis (1973) <ISBN: 978-0201076165>, including a 1-degree-of-freedom test for row*column 'non-additivity', linear in the row and column effects. Software Depends: R (>= 4.1.0) Suggests: knitr, rmarkdown Michael Friendly <friendly@yorku.ca> Comprehensive R Archive Network (CRAN) Michael Friendly [aut, cre] (ORCID: <https://orcid.org/0000-0002-3237-0941>), Richard M. Heiberger [aut], John Fox [ctb] GPL-3 2026-07-21 application/tgz https://CRAN.R-project.org/package=twoway doi:10.32614/CRAN.package.twoway en-US