Extract lme Object Grouping Formula

Usage

getGroupsFormula(object, asList)

Arguments

object an object inheriting from class lme, representing a fitted linear mixed-effects model.
asList an optional logical value. If TRUE the returned value with be a list of formulas; else, if FALSE the returned value will be a one-sided formula. Defaults to FALSE.

Description

The grouping formula associated with the random effects structure (reStruct) of object is returned either as a named list of one-sided formulas, or a single one-sided formula, depending on the value of asList. The components of the returned list are ordered from outermost to innermost level and are named after the grouping factor expression.

Value

a one-sided formula, or a list of one-sided formulas, with the grouping structure associated with the random effects structure of object.

Author(s)

Jose Pinheiro and Douglas Bates

See Also

reStruct, getGroups.lme

Examples

library(lme)
data(Orthodont)
fm1 <- lme(distance ~ age + Sex, data = Orthodont, random = ~ 1)
getGroupsFormula(fm1)

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