\HeaderA{cmat}{Contrast matrix describing the experimental questions}{cmat}
\keyword{datasets}{cmat}
\begin{Description}\relax
This matrix of numerical constants describes the experimental question, \eqn{p}{} say. Each experimental question is
described by a single contrast vector (a single row in cmat) or by a contrast matrix
(several rows in cmat). The ordering of the columns corresponds to that of the associated
design matrix X. Thus, typically the first two elements in a row of cmat are reserved for
for the two dyes. E.g. to compare the two dyes, we set (-1, 1, 0, ..., 0).
\end{Description}
\begin{Usage}
\begin{verbatim}data(cmat)\end{verbatim}
\end{Usage}
\begin{References}\relax
Bretz, F and Landgrebe J and Brunner E (2003):"Design and analysis of
two colour factorial microarray experiments", submitted.
\end{References}
\begin{Examples}
\begin{ExampleCode}
data(cmat)
## maybe str(cmat) ; plot(cmat) ...
\end{ExampleCode}
\end{Examples}

