getGroups.lme {nlme} | R Documentation |
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.
## S3 method for class 'lme': getGroups(object, form, level, data, sep)
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. |
data |
unused |
sep |
character, the separator to use between group levels when
multiple levels are collapsed. The default is '/' . |
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.
Jose Pinheiro Jose.Pinheiro@pharma.novartis.com and Douglas Bates bates@stat.wisc.edu
fm1 <- lme(pixel ~ day + day^2, Pixel, random = list(Dog = ~day, Side = ~1)) getGroups(fm1, level = 1:2)