varWeights {nlme}

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)

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.

Author(s)

José Pinheiro and Douglas Bates [e-mail]

References

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

See Also

logLik.varFunc, varWeights

Examples

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