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.

Value

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

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]
#>  [1] 0.5358867 0.5011872 0.4745103 0.4530661 0.5358867 0.5011872 0.4745103
#>  [8] 0.4530661 0.5358867 0.5011872