\HeaderA{studyCenter}{Center the expression values in a study to zero}{studyCenter}
\keyword{methods}{studyCenter}
\begin{Description}\relax
Centers each study in a list so that the average expression value of
each stuy is zero
\end{Description}
\begin{Usage}
\begin{verbatim}
studyCenter(object)
\end{verbatim}
\end{Usage}
\begin{Arguments}
\begin{ldescription}
\item[\code{object}] An object of class \code{ExpressionSetList}
\end{ldescription}
\end{Arguments}
\begin{Value}
An object of class \code{ExpressionSetList}
\end{Value}
\begin{Author}\relax
R. Scharpf
\end{Author}
\begin{SeeAlso}\relax
\code{\LinkA{geneCenter}{geneCenter}}, \code{\LinkA{ExpressionSetList-class}{ExpressionSetList.Rdash.class}}
\end{SeeAlso}
\begin{Examples}
\begin{ExampleCode}
  data(expressionSetList)
  centered <- studyCenter(expressionSetList)
  lapply(centered, function(object) round(mean(exprs(object)), 4))
\end{ExampleCode}
\end{Examples}

