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.
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)
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
be called by the user.
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.