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]