object sequentially from last to first.
"recalc"(object, conLin, ...)"modelStruct",
representing a list of model components, such as corStruct and
varFunc objects."Xy", corresponding to a regression
matrix (X) combined with a response vector (y), and
"logLik", corresponding to the log-likelihood of the
underlying model. Defaults to attr(object, "conLin").recalc.corStruct,
recalc.reStruct,
recalc.varFunc