Combination of Variance Functions

This function is a constructor for the varComb class, representing a combination of variance functions. The corresponding variance function is equal to the product of the variance functions of the varFunc objects listed in ....

varComb(...)

Arguments

...

objects inheriting from class varFunc representing variance function structures.

Value

a varComb object representing a combination of variance functions, also inheriting from class varFunc.

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

varClasses, varWeights.varComb, coef.varComb

Examples

vf1 <- varComb(varIdent(form = ~1|Sex), varPower())