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 Bates

See Also

covariate<-.varFunc

Examples

library(lme)
data(Orthodont)
vf1 <- varPower(1.1, form = ~age)
covariate(vf1) <- Orthodont[["age"]]
getCovariate(vf1)


[Package Contents]