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\name{RMfixed}
\alias{RMfixed}
\title{Fixed Effect Model}
%\usage{
%}
\description{Expressions of the form \code{X@RMfixed(beta)} can be used
within a formula of the type
\deqn{response ~ fixed effects + random effects + error term}
that specifies the Linear Mixed Model.
Important remark: \code{RMfixed} is NOT a function although
the parentheses notation is used to specify the vector of coefficients.
The matrix \eqn{X} is the design matrix and \eqn{\beta} is a vector of coefficients.
Note that a fixed effect of the form \eqn{X} is interpreted as
\code{X@RMfixed(beta=NA)} by default (and \eqn{\beta} is estimated
provided that the formula is used in \command{\link{RFfit}}).
Note that the \code{1} in an expression \code{1@RMfixed(beta)} is
interpreted as the identity matrix.
}
%\arguments{
%}
%\value{
%}
%\references{Chiles, J. P., Delfiner, P. (1999) \emph{Geostatistics:
% Modelling Spatial Uncertainty.} New York: John Wiley & Sons.
%}
\me
\seealso{
\command{\link{RMmodel}},
\command{\link{RFformula}},
\command{\link{RFsimulate}}.
}
\examples{\dontshow{StartExample()}
## For examples see the help page of 'RFformula'. ##
\dontshow{FinalizeExample()}}
\keyword{models}
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