Returns a category-weighted contrast matrix
contr.wsum(x, weights = rep.int(1.0, length(x)), sparse = FALSE)
A matrix with nlevels(x)
rows and nlevels(x)- 1
columns.
a factor vector
a vector of weights with the same length as x
.
ogical indicating if the result should be sparse (of class dgCMatrix
), using package Matrix.
Reto Burgin
Computes a contrast matrix similar to contr.sum
. The
reference category is however weighted by the sum of weights of the
other categories.
x <- factor(rep(LETTERS[1:3], c(10, 20, 30)))
contr.wsum(x) # standard call
contr.wsum(x, sparse = TRUE) # using a sparse matrix
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