# corPagel

From ape v3.0-2
by Emmanuel Paradis

##### Pagel's ``lambda'' Correlation Structure

The correlation structure from the present model is derived from the Brownian motion model by multiplying the off-diagonal elements (i.e., the covariances) by $\lambda$. The variances are thus the same than for a Brownian motion model.

- Keywords
- models

##### Usage

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

##### Value

an object of class `"corPagel"`

, the coefficients from an object
of this class, or the correlation matrix of an initialized object of
this class. In most situations, only `corPagel`

will be called
by the user.

##### References

Freckleton, R. P., Harvey, P. H. and M. Pagel, M. (2002) Phylogenetic
analysis and comparative data: a test and review of evidence.
*American Naturalist*, **160**, 712--726.

Pagel, M. (1999) Inferring the historical patterns of biological
evolution. *Nature*, **401**,877--884.

*Documentation reproduced from package ape, version 3.0-2, License: GPL (>= 2)*

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