# corBlomberg

From ape v2.7-3
by Emmanuel Paradis

##### Blomberg et al.'s Correlation Structure

The ``ACDC'' (accelerated/decelerated) model assumes that continuous traits evolve under a Brownian motion model which rates accelerates (if $g$ < 1) or decelerates (if $g$ > 1) through time. If $g$ = 1, then the model reduces to a Brownian motion model.

- Keywords
- models

##### Usage

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

##### Value

an object of class `"corBlomberg"`

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

will
be called by the user.

##### References

Blomberg, S. P., Garland, Jr, T., and Ives, A. R. (2003) Testing for
phylogenetic signal in comparative data: behavioral traits are more
labile. *Evolution*, **57**, 717--745.

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

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