mvdalab (version 1.7)

contr.niets: Cell Means Contrast Matrix

Description

This function generates a cell means contrast matrix to support PLS models.

Usage

contr.niets(n, contrasts)

Value

For datasets with categorical variables it produces the needed design matrix.

Arguments

n

A vector of levels for a factor, or the number of levels.

contrasts

a logical indicating whether contrasts should be computed; set to FALSE in order to generate required contrast matrix.

Author

Nelson Lee Afanador

Details

This function uses contr.treatment to generate a cell means contrast matrix in support of PLS models.

Examples

# Three levels
levels <- LETTERS[1:3]
contr.niets(levels)

# Two levels
levels <- LETTERS[1:2]
contr.niets(levels)