ape (version 3.0-1)

corBrownian: Brownian Correlation Structure

Description

Expected covariance under a Brownian model (Felsenstein 1985, Martins and Hansen 1997)

$$V_{ij} = \gamma \times t_a$$

where $t_a$ is the distance on the phylogeny between the root and the most recent common ancestor of taxa $i$ and $j$ and $\gamma$ is a constant.

Usage

corBrownian(value=1, phy, form=~1)
## S3 method for class 'corBrownian':
coef(object, unconstrained = TRUE, ...)
## S3 method for class 'corBrownian':
corMatrix(object, covariate = getCovariate(object), corr = TRUE, ...)

Arguments

Value

An object of class corBrownian, or the coefficient from an object of this class (actually sends numeric(0)), or the correlation matrix of an initialized object of this class.

References

Felsenstein, J. (1985) Phylogenies and the comparative method. American Naturalist, 125, 1--15.

Martins, E. P. and Hansen, T. F. (1997) Phylogenies and the comparative method: a general approach to incorporating phylogenetic information into the analysis of interspecific data. American Naturalist, 149, 646--667.

See Also

corClasses