brown fits a Brownian motion model to the given data.
brown(data, tree)Phenotypic data for extant species, i.e., at the terminal ends of the phylogenetic tree. This can either be a numeric vector or a list. If it is a numeric vector, there must be one entry for every node. If it is a list, it must consist entirely of numeric vectors, each of which has one entry per node. A data-frame is coerced to a list.
A phylogenetic tree, specified as an ouchtree
object.
brown returns an object of class browntree. See
browntree-class for information on the methods of this
class.
Butler, M.A. and A.A. King (2004) Phylogenetic comparative analysis: a modeling approach for adaptive evolution. American Naturalist 164:683-695.