nlme (version 3.1-1)

getCovariate.varFunc: Extract varFunc Covariate

Description

This method function extracts the covariate(s) associated with the variance function represented by object, if any is present.

Usage

getCovariate(object)

Arguments

object

an object inheriting from class varFunc, representing a variance function structure.

Value

• if object has a covariate attribute, its value is returned; else NULL is returned.

See Also

covariate<-.varFunc

Examples

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