Variance Function Structure

Usage

varFunc(object)

Arguments

object either an one-sided formula specifying a variance covariate, or an object inheriting from class code{varFunc}, representing a variance function structure.

Description

If object is a one-sided formula, it is used as the argument to varFixed and the resulting object is returned. Else, if object inherits from class varFunc, it is returned unchanged.

Value

an object from class varFunc, representing a variance function structure.

Author(s)

Jose Pinheiro and Douglas Bates

See Also

varFixed, varWeights.varFunc, coef.varFunc

Examples

vf1 <- varFunc(~age)

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