Description Usage Arguments Value Author(s) References
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.
1 2 3 4 5 6 |
value |
the (initial) value of the parameter lambda. |
phy |
an object of class |
form |
(ignored). |
fixed |
a logical specifying whether |
object |
an (initialized) object of class |
covariate |
(ignored). |
corr |
a logical value specifying whether to return the correlation matrix (the default) or the variance-covariance matrix. |
unconstrained |
a logical value. If |
... |
further arguments passed to or from other methods. |
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.
Emmanuel Paradis
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.
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