# corGrafen

From ape v2.7-3
by Emmanuel Paradis

##### Grafen's (1989) Correlation Structure

Grafen's (1989) covariance structure. Branch lengths are computed using
Grafen's method (see `compute.brlen`

). The covariance
matrice is then the traditional variance-covariance matrix for a
phylogeny.

- Keywords
- models

##### Usage

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

##### Value

An object of class `corGrafen`

or the rho coefficient from an
object of this class or the correlation matrix of an initialized
object of this class.

##### References

Grafen, A. (1989) The phylogenetic regression. *Philosophical
Transactions of the Royal society of London. Series B. Biological
Sciences*, **326**, 119--157.

##### See Also

*Documentation reproduced from package ape, version 2.7-3, License: GPL (>= 2)*

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