Extract lmList Object Grouping Formula

Usage

getGroupsFormula(object, asList)

Arguments

object an object inheriting from class lmList, representing a list of lm objects with a common 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

A formula representing the grouping factor determining the partitioning of the observations used to produce the lm components of object is obtained and returned as a list with a single component, or as a one-sided formula.

Value

a one-sided formula, or a list with a single one-sided formula, representing the grouping factor corresponding to the lm components of object.

Author(s)

Jose Pinheiro and Douglas Bates

See Also

lmList, getGroups.lmList

Examples

library(lme)
data(Orthodont)
fm1 <- lmList(distance ~ age | Subject, Orthodont)
getGroupsFormula(fm1)


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