varComb                 package:nlme                 R Documentation

Combination of Variance Functions

Description:

     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 '...'.

Usage:

     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'.

Author(s):

     Jose Pinheiro Jose.Pinheiro@pharma.novartis.com and Douglas Bates
     bates@stat.wisc.edu

References:

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

See Also:

     'varClasses', 'varWeights.varComb', 'coef.varComb'

Examples:

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

