\HeaderA{Wheat2}{Wheat Yield Trials}{Wheat2}
\keyword{datasets}{Wheat2}
\begin{Description}\relax
The \code{Wheat2} data frame has 224 rows and 5 columns.
\end{Description}
\begin{Format}\relax
This data frame contains the following columns:
\describe{
\item[Block] an ordered factor with levels
\code{4} < \code{2} < \code{3} < \code{1}

\item[variety] a factor with levels
\code{ARAPAHOE} 
\code{BRULE} 
\code{BUCKSKIN} 
\code{CENTURA} 
\code{CENTURK78} 
\code{CHEYENNE} 
\code{CODY} 
\code{COLT} 
\code{GAGE} 
\code{HOMESTEAD} 
\code{KS831374} 
\code{LANCER} 
\code{LANCOTA} 
\code{NE83404} 
\code{NE83406} 
\code{NE83407} 
\code{NE83432} 
\code{NE83498} 
\code{NE83T12} 
\code{NE84557} 
\code{NE85556} 
\code{NE85623} 
\code{NE86482} 
\code{NE86501} 
\code{NE86503} 
\code{NE86507} 
\code{NE86509} 
\code{NE86527} 
\code{NE86582} 
\code{NE86606} 
\code{NE86607} 
\code{NE86T666} 
\code{NE87403} 
\code{NE87408} 
\code{NE87409} 
\code{NE87446} 
\code{NE87451} 
\code{NE87457} 
\code{NE87463} 
\code{NE87499} 
\code{NE87512} 
\code{NE87513} 
\code{NE87522} 
\code{NE87612} 
\code{NE87613} 
\code{NE87615} 
\code{NE87619} 
\code{NE87627} 
\code{NORKAN} 
\code{REDLAND} 
\code{ROUGHRIDER} 
\code{SCOUT66} 
\code{SIOUXLAND} 
\code{TAM107} 
\code{TAM200} 
\code{VONA} 

\item[yield] a numeric vector

\item[latitude] a numeric vector

\item[longitude] a numeric vector

}
\end{Format}
\begin{Source}\relax
Pinheiro, J. C. and Bates, D. M. (2000), \emph{Mixed-Effects Models in S
and S-PLUS}, Springer, New York.
\end{Source}

