getCovariate.varFunc: Extract varFunc Covariate

Description Usage Arguments Value Author(s) See Also Examples

View source: R/varFunc.R

Description

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

Usage

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## S3 method for class 'varFunc'
getCovariate(object, form, data)

Arguments

object

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

form

an optional formula specifying the covariate to be evaluated in object. Defaults to formula(object).

data

some methods for this generic require a data object. Not used in this method.

Value

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

Author(s)

Jos<c3><a9> Pinheiro and Douglas Bates [email protected]

See Also

covariate<-.varFunc

Examples

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

nlme documentation built on May 30, 2017, 3:12 a.m.