phyl.cca(tree, X, Y, lambda=1.0, fixed=TRUE)
"phylo"
format.X
.lambda
.lambda
using likelihood.optimize
on the interval (0,1).
Revell, L. J. (2012) phytools: An R package for phylogenetic comparative biology (and other things). Methods Ecol. Evol., 3, 217-223.
phyl.pca