Assign varFunc Covariate

DESCRIPTION:

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).

USAGE:

covariate(object) <- value 

REQUIRED 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.

SEE ALSO:

EXAMPLES:

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