getGroupsFormula.lme {nlme} | R Documentation |
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.
getGroupsFormula(object, asList)
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 . |
a one-sided formula, or a list of one-sided formulas, with the
grouping structure associated with the random effects structure of
object
.
Jose Pinheiro and Douglas Bates
data(Orthodont) fm1 <- lme(distance ~ age + Sex, data = Orthodont, random = ~ 1) getGroupsFormula(fm1)