Assign varFunc Covariate

The covariate(s) used in the calculation of the weights of the variance function represented by object is (are) replaced by value. If object has been initialized, value must have the same dimensions as getCovariate(object).

# S3 method for class 'varFunc'
covariate(object) <- value

Arguments

object

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

value

a value to be assigned to the covariate associated with object.

Value

a varFunc object similar to object, but with its covariate attribute replaced by value.

Author

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

Examples

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