CHAID and Exhaustive CHAID Decision Trees R package chaidr version 0.1.0 An implementation in base 'R' of the CHAID (Chi-squared Automatic Interaction Detection) decision tree algorithm of Kass (1980) <doi:10.2307/2986296> and the Exhaustive CHAID variant of Biggs, de Ville, and Suen (1991) <doi:10.1080/02664769100000005>, as specified in the 'IBM SPSS' Statistics Algorithms documentation. Supports nominal, ordinal (with floating missing category), and continuous predictors, and nominal, ordinal, and continuous response variables using Pearson chi-squared, Goodman row-effects, and one-way ANOVA F tests respectively. Includes prediction, rule extraction, gains and lift analysis, validation on holdout data, and visualization via base graphics, 'Graphviz' DOT, 'plotly', and conversion to 'partykit' objects. Software Depends: R (>= 4.5) Imports: graphics, grDevices, stats, utils Suggests: DiagrammeR, ggparty, ggplot2, htmlwidgets, knitr, partykit, plotly, rmarkdown, rpart, spelling, testthat (>= 3.2.0), withr Osamu Morimoto <galactic.supermarket@gmail.com> Comprehensive R Archive Network (CRAN) Osamu Morimoto [aut, cre, cph] MIT + file LICENSE (https://CRAN.R-project.org/package=chaidr/LICENSE) 2026-08-08 application/tgz https://CRAN.R-project.org/package=chaidr doi:10.32614/CRAN.package.chaidr en-GB