# vcv.phylo

From ape v2.1-1
0th

Percentile

##### Phylogenetic Variance-covariance or Correlation Matrix

This function computes the expected variances and covariances of a continuous phenotype assuming it evolves under a given model (currently only the model of Brownian motion is available).

Keywords
multivariate, manip
##### Usage
vcv.phylo(phy, model = "Brownian", cor = FALSE)
##### Arguments
phy
an object of class "phylo".
model
a character giving the model used to compute the variances and covariances of the phynotype; by default "Brownian". Currently only the Brownian model is available.
cor
a logical indicating whether the correlation matrix should be returned (TRUE); by default the variance-covariance matrix is returned (FALSE).
##### Value

• a numeric matrix with the names of the tips (as given by the tip.label of the argument phy) as colnames and rownames.

##### References

Garland, T. Jr. and Ives, A. R. (2000) Using the past to predict the present: confidence intervals for regression equations in phylogenetic comparative methods. American Naturalist, 155, 346--364.

read.tree to read tree files in Newick format