getCovariate.varFunc {nlme}R Documentation

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.

Author(s)

Jose Pinheiro and Douglas Bates

See Also

covariate<-.varFunc

Examples

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


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