pdMat
objects
forming
object
, which have not yet been initialized, are
obtained using the methodology described in Bates and Pinheiro
(1998). These estimates may be refined using a series of EM
iterations, as described in Bates and Pinheiro (1998). The number of
EM iterations to be used is defined in
control
.
initialize(object, data, conLin, control)
reStruct
,
representing a random effects structure and consisting of a list of
pdMat
objects.
formula(object)
.
"Xy"
, corresponding to a regression matrix
(
X
) combined with a response vector (
y
), and
"logLik"
, corresponding to the log-likelihood of the
underlying model.
niterEM
controlling the number of iterations for the EM algorithm used to
refine initial parameter estimates. It is given as a list for
compatibility with other
initialize
methods. Defaults to
list(niterEM = 20)
.
reStruct
object similar to
object
, but with all
pdMat
components initialized.
Bates, D.M. and Pinheiro, J.C. (1998) "Computational methods for multilevel models" available in PostScript or PDF formats at http://nlme.stat.wisc.edu