\name{Wheat}
\alias{Wheat}
\title{Yields by growing conditions}
\description{
    The \code{Wheat} data frame has 48 rows and 4 columns.
}
\format{
    This data frame contains the following columns:
    \describe{
	\item{Tray}{
	    an ordered factor with levels
	    \code{3} < \code{1} < \code{2} < \code{4} < \code{5} < \code{6} < \code{8} < \code{9} < \code{7} < \code{12} < \code{11} < \code{10}
	}
	\item{Moisture}{
	    a numeric vector
	}
	\item{fertilizer}{
	    a numeric vector
	}
	\item{DryMatter}{
	    a numeric vector
	}
    }
}
\details{
}
\source{
    Pinheiro, J. C. and Bates, D. M. (2000), \emph{Mixed-Effects Models in S
	and S-PLUS}, Springer, New York.
}
\examples{
str(Wheat)
}
\keyword{datasets}