twoway

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 Tukey's Exploratory Data Analysis (1973) methods, including a 1-degree-of-freedom test for row*column 'non-additivity', linear in the row and column effects.

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