logLik.lme {nlme} | R Documentation |

## Log-Likelihood of an lme Object

### Description

If `REML=FALSE`

, returns the log-likelihood value of the linear
mixed-effects model represented by `object`

evaluated at the
estimated coefficients; else, the restricted log-likelihood evaluated
at the estimated coefficients is returned.

### Usage

## S3 method for class 'lme':
logLik(object, REML, ...)

### Arguments

`object` |
an object inheriting from class `lme` , representing
a fitted linear mixed-effects 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` . |

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

### Value

the (restricted) log-likelihood of the model represented by
`object`

evaluated at the estimated coefficients.

### Author(s)

Jose Pinheiro and Douglas Bates

### References

Harville, D.A. (1974) ``Bayesian Inference for Variance Components
Using Only Error Contrasts'', *Biometrika*, **61**, 383–385.

### See Also

`lme`

,`gls`

### Examples

fm1 <- lme(distance ~ Sex * age, Orthodont, random = ~ age, method = "ML")
logLik(fm1)
logLik(fm1, REML = TRUE)

[Package

*nlme* version 3.1-66

Index]