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% File src/library/stats/man/logLik.Rd
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% File src/library/stats/man/logLik.Rd
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% Part of the R package, http://www.R-project.org
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% Part of the R package, http://www.R-project.org
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% Copyright 1995-2012 R Core Team
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% Copyright 1995-2013 R Core Team
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% Distributed under GPL 2 or later
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% Distributed under GPL 2 or later
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\newcommand{\CRANpkg}{\href{http://CRAN.R-project.org/package=#1}{\pkg{#1}}}
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\newcommand{\CRANpkg}{\href{http://CRAN.R-project.org/package=#1}{\pkg{#1}}}
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\name{logLik}
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\name{logLik}
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  \CRANpkg{nlme}.
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  \CRANpkg{nlme}.
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}
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}
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%   \code{corStruct}, \code{lmList}, \code{lmeStruct}, \code{reStruct}, and
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%   \code{corStruct}, \code{lmList}, \code{lmeStruct}, \code{reStruct}, and
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%   \code{varFunc}.
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%   \code{varFunc}.
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\details{
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\details{
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  \code{logLik} is most commonly used for a model fitted by maximum
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  likelihood, and some uses, e.g. by \code{\link{AIC}}, assume this.  So
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  care is needed where other fit criteria have been used, for example
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  REML (the default for \code{"lme"}).
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  For a \code{"glm"} fit the \code{\link{family}} does not have to
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  For a \code{"glm"} fit the \code{\link{family}} does not have to
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  specify how to calculate the log-likelihood, so this is based on using
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  specify how to calculate the log-likelihood, so this is based on using
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  the family's \code{aic()} function to compute the AIC.  For the
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  the family's \code{aic()} function to compute the AIC.  For the
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  \code{\link{gaussian}}, \code{\link{Gamma}} and
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  \code{\link{gaussian}}, \code{\link{Gamma}} and
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  \code{\link{inverse.gaussian}} families it assumed that the dispersion
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  \code{\link{inverse.gaussian}} families it assumed that the dispersion
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  the restrictions if \code{REML = TRUE}).
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  the restrictions if \code{REML = TRUE}).
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}
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}
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\seealso{
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\seealso{
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  \code{\link[nlme:logLik.lme]{logLik.gls}}, \code{\link[nlme]{logLik.lme}}, in
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  \code{\link[nlme:logLik.lme]{logLik.gls}}, \code{\link[nlme]{logLik.lme}}, in
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  package \CRANpkg{nlme}, etc.
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  package \CRANpkg{nlme}, etc.
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  \code{\link{AIC}}
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}
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}
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\references{
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\references{
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  For \code{logLik.lm}:
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  For \code{logLik.lm}:
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  Harville, D.A. (1974).
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  Harville, D.A. (1974).