nlme: Initialize.lmeStruct – R documentation

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Initialize.lmeStruct

Initialize an lmeStruct Object

The individual linear mixed-effects model components of the lmeStruct list are initialized.

## S3 method for class 'lmeStruct'
Initialize(object, data, groups, conLin, control, ...)

`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.
`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.
`...`	some methods for this generic require additional arguments. None are used in this method.

an lmeStruct object similar to object, but with initialized model components.

José Pinheiro and Douglas Bates bates@stat.wisc.edu