\name{threestepPLM}
\alias{threestepPLM}
\title{Three Step expression measures returned as a PLMset}
\description{
  This function converts an
  \code{\link[affy:AffyBatch-class]{AffyBatch}} into an 
  \code{\link{PLMset}} using a three step expression measure.
}
\usage{
threestepPLM(object,subset=NULL, normalize=TRUE, background=TRUE,
             background.method="RMA.2", normalize.method="quantile",
             summary.method="median.polish", background.param = list(),
             normalize.param=list(), output.param=list(),
             model.param=list(), verbosity.level=0)
}
%- maybe also `usage' for other objects documented here.
\arguments{
  \item{object}{an \code{\link[affy:AffyBatch-class]{AffyBatch}}}
  \item{subset}{a vector with the names of probesets to be used. If NULL
  then all probesets are used.}
  \item{normalize}{logical value. If \code{TRUE} normalize data using
    quantile normalization}
  \item{background}{logical value. If \code{TRUE} background correct
    using RMA background correction}
  \item{background.method}{name of background method to use.}
  \item{normalize.method}{name of normalization method to use.}
  \item{summary.method}{name of summary method to use.}
  \item{background.param}{list of parameters for background correction methods}
  \item{normalize.param}{list of parameters for normalization methods}
  \item{output.param}{list of parameters for output methods}
  \item{model.param}{list of parameters for model methods}
  \item{verbosity.level}{An integer specifying how much to print
    out. Higher values indicate more verbose. A value of 0 will print nothing}

}
\details{
  This function computes the expression measure using threestep
  methods. It returns a \code{\link{PLMset}}. The most important
  difference is that the PLMset allows you to access the residuals
  which the \code{\link{threestep}} function does not do.
}
\value{
An \code{\link{PLMset}}
}

\author{Ben Bolstad \email{bmb@bmbolstad.com}}

\references{Bolstad, BM (2004) \emph{Low Level Analysis of High-density
    Oligonucleotide Array Data: Background, Normalization and
    Summarization}. PhD Dissertation. University of California,
  Berkeley.}

\seealso{\code{\link[affy]{expresso}},
  \code{\link[affy]{rma}}, \code{\link{threestep}},
  \code{\link{rmaPLM}}, \code{\link{fitPLM}}
}

\examples{
if (require(affydata)) {
  data(Dilution)

  # should be equivalent to rma()
  \dontrun{eset <- threestepPLM(Dilution)}
}
}
\keyword{manip}