contr.wsum {vcrpart}

Contrast matrices

Description

Returns a category-weighted contrast matrix

Usage

contr.wsum(x, weights = rep.int(1.0, length(x)), sparse = FALSE)

Arguments

x

a factor vector

weights

a vector of weights with the same length as x.

sparse

ogical indicating if the result should be sparse (of class dgCMatrix), using package Matrix.

Details

Computes a contrast matrix similar to contr.sum. The reference category is however weighted by the sum of weights of the other categories.

Value

A matrix with nlevels(x) rows and nlevels(x)- 1 columns.

Author(s)

Reto Burgin

See Also

contr.sum

Examples

x <- factor(rep(LETTERS[1:3], c(10, 20, 30)))
contr.wsum(x) # standard call
contr.wsum(x, sparse = TRUE) # using a sparse matrix