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% File nlme/man/Names.formula.Rd
% Part of the nlme package for R
% Distributed under GPL 2 or later: see nlme/LICENCE.note
\name{Names.formula}
\title{Extract Names from a formula}
\usage{
\method{Names}{formula}(object, data, exclude, \dots)
}
\alias{Names.formula}
\alias{Names.listForm}
\arguments{
\item{object}{an object inheriting from class \code{"\link{formula}"}.}
\item{data}{an optional data frame containing the variables specified
in \code{object}. By default the variables are taken from the
environment from which \code{Names.formula} is called.}
\item{exclude}{an optional character vector with names to be excluded
from the returned value. Default is \code{c("pi",".")}.}
\item{\dots}{some methods for this generic require additional
arguments. None are used in this method.}
}
\description{
This method function returns the names of the terms corresponding to
the right hand side of \code{object} (treated as a linear formula),
obtained as the column names of the corresponding
\code{model.matrix}.
}
\value{
a character vector with the column names of the \code{model.matrix}
corresponding to the right hand side of \code{object} which are not
listed in \code{excluded}.
}
\author{José Pinheiro and Douglas Bates \email{bates@stat.wisc.edu}}
\seealso{\code{\link{model.matrix}}, \code{\link{terms}},
\code{\link{Names}}
}
\examples{
Names(distance ~ Sex * age, data = Orthodont)
}
\keyword{models}
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