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
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.