Extract Variance Function Weights
DESCRIPTION:
The inverse of the standard deviations corresponding to the variance
function structure represented by
object are returned.
USAGE:
varWeights(object)
REQUIRED ARGUMENTS:
- object
-
an object inheriting from class
varFunc,
representing a variance function structure.
VALUE:
if
object has a
weights attribute, its value is
returned; else
NULL is returned.
SEE ALSO:
EXAMPLES:
vf1 <- varPower(form=~age)
vf1 <- initialize(vf1, Orthodont)
coef(vf1) <- 0.3
varWeights(vf1)[1:10]