break_up_matrix_term function

Break up matrix terms

Sometimes there can be terms in a formula that refer to a matrix instead of a single predictor. This function breaks up the matrix term into individual predictors to handle separately, as that is probably the intention of the user.

break_up_matrix_term(formula, data)

Arguments

• formula: A formula for a valid model.
• data: The original data.frame with a matrix as predictor.

Returns

A list containing the expanded formula and the expanded data.frame.