\HeaderA{cement}{Hald's Cement Data}{cement}
\methaliasA{cement.miss}{cement}{cement.miss}
\keyword{datasets}{cement}
\begin{Description}\relax
Heat evolved in setting of cement, as a function of its chemical
composition.
\end{Description}
\begin{Usage}
\begin{verbatim}
data(cement)
data(cement.miss)
\end{verbatim}
\end{Usage}
\begin{Format}\relax
A \code{data.frame} with 13 observations on the following 5 variables.
\describe{
\item[x1 ] percentage weight in clinkers of 3CaO.Al2O3
\item[x2 ] percentage weight in clinkers of 3CaO.SiO2
\item[x3 ] percentage weight in clinkers of 4CaO.Al2O3.Fe2O3
\item[x4 ] percentage weight in clinkers of 2CaO.SiO2
\item[y ] heat evolved (calories/gram)
}
\end{Format}
\begin{Details}\relax
\code{cement.miss} is taken from an example in Little \& Rubin's book
on \emph{Statistical Analysis with Missing Data} (2002), pp.\textasciitilde{}154, for
demonstrating estimation of multivariate means and variances when
the missing data pattern is monotone.  These are indicated by
\code{NA} in \code{cement.miss}.  See the examples section of
\code{\LinkA{monomvn}{monomvn}} for a re-working of the example from the textbook
\end{Details}
\begin{Source}\relax
Woods, H., Steinour, H. H. and Starke, H. R. (1932) 
Effect of composition of Portland cement on heat evolved during hardening.
\emph{Industrial Engineering and Chemistry}, \bold{24}, 1207--1214.
\end{Source}
\begin{References}\relax
Davison, A. C. (2003)  \emph{Statistical Models}.  Cambridge University Press.
Page 355.

Draper, N.R. and Smith, H. (1998) \emph{Applied Regression
Analysis}. Wiley. Page 630.

Roderick J.A. Little and Donald B. Rubin (2002).
\emph{Statistical Analysis with Missing Data}, Second Edition.
Wilely.  Page 154.

\url{http://www.statslab.cam.ac.uk/~bobby/monomvn.html}
\end{References}
\begin{SeeAlso}\relax
\code{\LinkA{monomvn}{monomvn}} --  Several other \R{} packages also include
this data set
\end{SeeAlso}
\begin{Examples}
\begin{ExampleCode}
data(cement)
lm(y~x1+x2+x3+x4,data=cement)
\end{ExampleCode}
\end{Examples}

