Extract varFunc Covariate

Share:

Description

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

Usage

1
2
## 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)

José Pinheiro and Douglas Bates bates@stat.wisc.edu

See Also

covariate<-.varFunc

Examples

1
2
3
vf1 <- varPower(1.1, form = ~age)
covariate(vf1) <- Orthodont[["age"]]
getCovariate(vf1)

Want to suggest features or report bugs for rdrr.io? Use the GitHub issue tracker.