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"]]