Learn R Programming

phytools (version 0.5-38)

phyl.cca: Phylogenetic canonical correlation analysis

Description

This function performs phylogenetic canonical correlation analysis (e.g., Revell & Harrison 2008; Bioinformatics).

Usage

phyl.cca(tree, X, Y, lambda=1.0, fixed=TRUE)

Arguments

tree
a phylogenetic tree in "phylo" format.
X
a data matrix with traits in columns.
Y
data matrix with traits in columns, to be correlated with X.
lambda
optionally, a (fixed) value for lambda.
fixed
optionally, a logical value indicating whether or not to estimate lambda using likelihood.

Value

A list with the following components:
cor
canonical correlations.
xcoef
coefficients for the canonical variables for X.
ycoef
coefficients for the canonical variables for Y.
xscores
matrix with the canonical scores for X.
yscores
matrix with the canonical scores for Y.
chisq
vector of $\chi^2$ values.
p
P-values for the hypothesis test that the ith and all subsequent correlations are zero.

Details

(Optional) joint optimization of $\lambda$ is performed using optimize on the interval (0,1).

References

Revell, L. J., Harrison, A. S. (2008) PCCA: A program for phylogenetic canonical correlation analysis. Bioinformatics, 24, 1018-1020.

Revell, L. J. (2012) phytools: An R package for phylogenetic comparative biology (and other things). Methods Ecol. Evol., 3, 217-223.

See Also

phyl.pca