Alternative Factor Coding Matrices for Linear Model Formulae

A collection of coding functions as alternatives to the standard functions in the stats package, which have names starting with 'contr.'. Their main advantage is that they provide a consistent method for defining marginal effects in factorial models. In a simple one-way ANOVA model the intercept term is always the simple average of the class means.


Reference manual

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0.3.1 by Bill Venables, 5 months ago

Browse source code at

Authors: Bill Venables

Documentation:   PDF Manual  

GPL (>= 2) license

Imports Matrix, methods, fractional, utils

Depends on stats

Suggests knitr, MASS, dplyr, car, ggplot2

See at CRAN