\HeaderA{ranef.lmList}{Extract lmList Random Effects}{ranef.lmList}
\aliasA{random.effects.lmList}{ranef.lmList}{random.effects.lmList}
\keyword{models}{ranef.lmList}
\begin{Description}\relax
The difference between the individual \code{lm} components
coefficients and their average is calculated.
\end{Description}
\begin{Usage}
\begin{verbatim}
## S3 method for class 'lmList':
ranef(object, augFrame, data, which, FUN, standard,
                 omitGroupingFactor, ...)
\end{verbatim}
\end{Usage}
\begin{Arguments}
\begin{ldescription}
\item[\code{object}] an object inheriting from class \code{lmList}, representing
a list of \code{lm} objects with a common model.

\item[\code{augFrame}] an optional logical value. If \code{TRUE}, the returned
data frame is augmented with variables defined in \code{data}; else,
if \code{FALSE}, only the coefficients are returned. Defaults to
\code{FALSE}.
\item[\code{data}] an optional data frame with the variables to be used for
augmenting the returned data frame when \code{augFrame =
     TRUE}. Defaults to the data frame used to fit \code{object}.
\item[\code{which}] an optional positive integer vector specifying which
columns of \code{data} should be used in the augmentation of the
returned data frame. Defaults to all columns in \code{data}.
\item[\code{FUN}] an optional summary function or a list of summary functions
to be applied to group-varying variables, when collapsing \code{data}
by groups.  Group-invariant variables are always summarized by the
unique value that they assume within that group. If \code{FUN} is a
single function it will be applied to each non-invariant variable by
group to produce the summary for that variable.  If \code{FUN} is a
list of functions, the names in the list should designate classes of
variables in the frame such as \code{ordered}, \code{factor}, or
\code{numeric}.  The indicated function will be applied to any
group-varying variables of that class.  The default functions to be
used are \code{mean} for numeric factors, and \code{Mode} for both
\code{factor} and \code{ordered}.  The \code{Mode} function, defined
internally in \code{gsummary}, returns the modal or most popular
value of the variable.  It is different from the \code{mode} function
that returns the S-language mode of the variable.
\item[\code{standard}] an optional logical value indicating whether the
estimated random effects should be "standardized" (i.e. divided by
the corresponding estimated standard error). Defaults to
\code{FALSE}.
\item[\code{omitGroupingFactor}] an optional logical value.  When \code{TRUE}
the grouping factor itself will be omitted from the group-wise
summary of \code{data} but the levels of the grouping factor will
continue to be used as the row names for the returned data frame.
Defaults to \code{FALSE}.
\item[\code{...}] some methods for this generic require additional
arguments.  None are used in this method.
\end{ldescription}
\end{Arguments}
\begin{Value}
a vector with the differences between the individual \code{lm}
coefficients in \code{object} and their average.
\end{Value}
\begin{Author}\relax
Jose Pinheiro \email{Jose.Pinheiro@pharma.novartis.com} and Douglas Bates \email{bates@stat.wisc.edu}
\end{Author}
\begin{SeeAlso}\relax
\code{\LinkA{lmList}{lmList}}, \code{\LinkA{fixed.effects.lmList}{fixed.effects.lmList}}
\end{SeeAlso}
\begin{Examples}
\begin{ExampleCode}
fm1 <- lmList(distance ~ age | Subject, Orthodont)
ranef(fm1)
random.effects(fm1)              # same as above
\end{ExampleCode}
\end{Examples}

