Extract varFunc Covariate
Usage
getCovariate(object)
Arguments
object
|
an object inheriting from class code{varFunc},
representing a variance function structure.
|
Description
This method function extracts the covariate(s) associated with the
variance function represented by object
, if any is present.Value
if object
has a covariate
attribute, its value is
returned; else NULL
is returned.Author(s)
Jose Pinheiro and Douglas BatesSee Also
covariate<-.varFunc
Examples
library(lme)
data(Orthodont)
vf1 <- varPower(1.1, form = ~age)
covariate(vf1) <- Orthodont[["age"]]
getCovariate(vf1)