Description Usage Arguments Value Author(s)
View source: R/matrix_contrasts.R
This function assembles multiple vectors of contrasts weights into a matrix. All pairwise contrasts between habitats on each island are computed separately. Contrasts between habitats across islands are not considered.
1 | matrix_contrasts(specdata)
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specdata |
A data frame containing at least columns for the dependent variables, as well as a column "island" and a column "habitat". |
A matrix of contrast weights. Each row is a contrast. Each column is a habitat on a given island. Each row is filled with zeros, except the two habitats to compare, which are given values 1 and -1.
Raphael Scherrer
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