Performs a co-inertia of the triplets \((Q_1,K_1,R_0)\) and \((Q_2,K_2,R_0)\) with identity matrices \(K_1, K_2, R_0\).
coinertiaI(X, Y, fast = TRUE)Species matrix X.
Species Matrix Y.
If "TRUE" only return the row scores of
Y.
If fast = TRUE, a matrix of row scores for matrix
Y (see scores below). If
fast = FALSE a list with the following components:
A list with components X and
Y containing the left and right singular vectors
respectivley of the SVD on the triplets.
A list with components X and
Y, containing the row scores of the
X and Y species matrices. These are
the result of a matrix multiplication of X by the
left singular vectors and Y by the right singular
vectors.
the Eigenvalues of the analysis (the square of the singular values from the SVD.
the matched function call.
Argument fast is used to return only the row scores of
Y in function permutest.coca, which speeds the
permutation test considerably.
Doledec, S and Chessel, D. (1994) Co-inertia analysis: a method for studying species-environment relationships. Freshwater Biology 31, 277--294.