Extract corStruct Groups
This method function extracts the grouping factor associated with
object, if any is present.
## S3 method for class 'corStruct' getGroups(object, form, level, data, sep)
object |
an object inheriting from class |
form |
this argument is included to make the method function
compatible with the generic. It will be assigned the value of
|
level |
this argument is included to make the method function compatible with the generic and is not used. |
data |
an optional data frame in which to evaluate the variables
defined in |
sep |
character, the separator to use between group levels when
multiple levels are collapsed. The default is |
if a grouping factor is present in the correlation structure
represented by object, the function returns the corresponding
factor vector; else the function returns NULL.
José Pinheiro and Douglas Bates bates@stat.wisc.edu
cs1 <- corAR1(form = ~ 1 | Subject) getGroups(cs1, data = Orthodont)
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