R: Log-Likelihood of an lmList Object

logLik.lmList {nlme}

R Documentation

Log-Likelihood of an lmList Object

Description

If pool=FALSE, the (restricted) log-likelihoods of the lm components of object are summed together. Else, the (restricted) log-likelihood of the lm fit with different coefficients for each level of the grouping factor associated with the partitioning of the object components is obtained.

Usage

## S3 method for class 'lmList'
logLik(object, REML, pool, ...)

Arguments

`object`	an object inheriting from class `"lmList"`, representing a list of `lm` objects with a common model.
`REML`	an optional logical value. If `TRUE` the restricted log-likelihood is returned, else, if `FALSE`, the log-likelihood is returned. Defaults to `FALSE`.
`pool`	an optional logical value indicating whether all `lm` components of `object` may be assumed to have the same error variance. Default is `attr(object, "pool")`.
`...`	some methods for this generic require additional arguments. None are used in this method.

Value

either the sum of the (restricted) log-likelihoods of each lm component in object, or the (restricted) log-likelihood for the lm fit with separate coefficients for each component of object.

Author(s)

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

Examples

fm1 <- lmList(distance ~ age | Subject, Orthodont)
logLik(fm1)   # returns NA when it should not

[Package nlme version 3.1-166 Index]