nlme: varFunc – R documentation

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varFunc

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.

Usage

varFunc(object)

Arguments

object

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

Value

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

Author(s)

José Pinheiro and Douglas Bates bates@stat.wisc.edu

Examples

vf1 <- varFunc(~age)

nlme

Linear and Nonlinear Mixed Effects Models

v3.1-152

GPL (>= 2) | file LICENCE

Authors

José Pinheiro [aut] (S version), Douglas Bates [aut] (up to 2007), Saikat DebRoy [ctb] (up to 2002), Deepayan Sarkar [ctb] (up to 2005), EISPACK authors [ctb] (src/rs.f), Siem Heisterkamp [ctb] (Author fixed sigma), Bert Van Willigen [ctb] (Programmer fixed sigma), Johannes Ranke [ctb] (varConstProp()), R-core [aut, cre]

Initial release

2021-02-03