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Carries out analyses of twoway tables with one observation per cell, together with graphical displays for an additive fit and a diagnostic plot for removable 'nonadditivity' via a power transformation of the response. It implements Tukey's Exploratory Data Analysis (1973) <ISBN: 9780201076165> methods, including a 1degreeoffreedom test for row*column 'nonadditivity', linear in the row and column effects.
Package details 


Author  Michael Friendly [aut, cre] (<https://orcid.org/0000000232370941>), Richard M. Heiberger [aut], John Fox [ctb] 
Maintainer  Michael Friendly <friendly@yorku.ca> 
License  GPL3 
Version  0.6.3 
URL  https://github.com/friendly/twoway 
Package repository  View on CRAN 
Installation 
Install the latest version of this package by entering the following in R:

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