This model matrix is similar to model.matrix. But it does not omit unnecessary columns.
ModelMatrix(Formula, Data, KeepOrder=FALSE)a conventional formula for a linear model
a data.frame to be analyzed
If KeepOrder is TRUE, terms in Formula will be kept. This is for Type I SS.
Model matrix and attributes similar to the output of model.matrix.
design matrix, i.e. model matrix
detailed information about terms such as formula and labels
term indices
assignemnt of columns for each terms in order, different way of expressing term indices
It makes the model(design) matrix for GLM.