varWeights function

Extract Variance Function Weights

The inverse of the standard deviations corresponding to the variance function structure represented by object are returned.

varWeights(object)

Arguments

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

Returns

if object has a weights attribute, its value is returned; else NULL is returned.

References

Pinheiro, J.C., and Bates, D.M. (2000) "Mixed-Effects Models in S and S-PLUS", Springer.

Author(s)

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

See Also

logLik.varFunc, varWeights

Examples

vf1 <- varPower(form=~age)
vf1 <- Initialize(vf1, Orthodont)
coef(vf1) <- 0.3
varWeights(vf1)[1:10]