Extract lme Object Groups
Usage
getGroups(object, form, level)
Arguments
object
|
an object inheriting from class lme , representing
a fitted linear mixed-effects model.
|
form
|
this argument is included to make the method function
compatible with the generic and is ignored in this method.
|
level
|
an optional integer vector giving the level(s) of grouping
to be extracted from object . Defaults to the highest or
innermost level of grouping.
|
Description
The grouping factors corresponding to the linear mixed-effects model
represented by object
are extracted. If more than one level is
indicated in level
, the corresponding grouping factors are
combined into a data frame; else the selected grouping factor is
returned as a vector.Value
either a data frame with columns given by the grouping factors
indicated in level
, or, when a single level is requested, a
factor representing the selected grouping factor.Author(s)
Jose Pinheiro and Douglas BatesSee Also
lme
Examples
library(lme)
data(Pixel)
fm1 <- lme(pixel ~ day + day^2, Pixel,
random = list(Dog = ~day, Side = ~1))
getGroups(fm1, level = 1:2)