The response matrix for mdm diversity analyses requires that species
(columns of the data matrix) are scaled to proportions i.e. that they sum to one
for each site (row of the data matrix).
Two matrices are particularly useful; these correspond to alpha and gamma diversities.
The former is particularly useful for
mdm anovas that include
the alpha model which is computationally expensive using the function
matrix or data frame of numeric values to be transformed
if mean = TRUE then each row is replaced by the species means scaled to row sums of one
A matrix of the same dimensions as the input matrix. Each row of the matrix will sum to one.
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