The individual linear mixed-effects model components of the
lmeStruct
list are initialized.
USAGE:
initialize(object, data, groups, conLin, control)
REQUIRED ARGUMENTS:
object
an object inheriting from class
lmeStruct,
representing a list of linear mixed-effects model components, such as
reStruct,
corStruct, and
varFunc objects.
data
a data frame in which to evaluate the variables defined in
formula(object).
groups
a data frame with the grouping factors corresponding to
the lme model associated with
object as columns, sorted from
innermost to outermost grouping level.
OPTIONAL ARGUMENTS:
conLin
an optional condensed linear model object, consisting of
a list with components
"Xy", corresponding to a regression
matrix (
X) combined with a response vector (
y), and
"logLik", corresponding to the log-likelihood of the
underlying lme model. Defaults to
attr(object, "conLin").
control
an optional list with control parameters for the
initialization and optimization algorithms used in
lme. Defaults to
list(niterEM=20, gradHess=TRUE),
implying that 20 EM iterations are to be used in the derivation of
initial estimates for the coefficients of the
reStruct
component of
object and, if possible, numerical gradient
vectors and Hessian matrices for the log-likelihood function are to
be used in the optimization algorithm.
VALUE:
an
lmeStruct object similar to
object, but with
initialized model components.