Extract corStruct Object Covariate
Usage
getCovariate(object, form, data)
Arguments
object
|
an object inheriting from class corStruct
representing a correlation structure.
|
form
|
this argument is included to make the method function
compatible with the generic. It will be assigned the value of
formula(object) and should not be modified.
|
data
|
an optional data frame in which to evaluate the variables
defined in form , in case object is not initialized and
the covariate needs to be evaluated.
|
Description
This method function extracts the covariate(s) associated with
object
.Value
when the correlation structure does not include a grouping factor, the
returned value will be a vector or a matrix with the covariate(s)
associated with object
. If a grouping factor is present, the
returned value will be a list of vectors or matrices with the
covariate(s) corresponding to each grouping level.Author(s)
Jose Pinheiro and Douglas BatesSee Also
getCovariate
Examples
library(lme)
data(Orthodont)
cs1 <- corAR1(form = ~ 1 | Subject)
getCovariate(cs1, data = Orthodont)