\HeaderA{urine}{Urine Analysis Data}{urine}
\keyword{datasets}{urine}
\begin{Description}\relax
The \code{urine} data frame has 79 rows and 7 columns.


79 urine specimens were analyzed in an effort to determine if certain physical
characteristics of the urine might be related to the formation of calcium
oxalate crystals.
\end{Description}
\begin{Usage}
\begin{verbatim}
urine
\end{verbatim}
\end{Usage}
\begin{Format}\relax
This data frame contains the following columns:


\describe{
\item[\code{r}] Indicator of the presence of calcium oxalate crystals.

\item[\code{gravity}] The specific gravity of the urine.

\item[\code{ph}] The pH reading of the urine.

\item[\code{osmo}] The osmolarity of the urine. Osmolarity is proportional to the concentration
of molecules in solution.

\item[\code{cond}] The conductivity of the urine.  Conductivity is proportional to the 
concentration of charged ions in solution.

\item[\code{urea}] The urea concentration in millimoles per litre.

\item[\code{calc}] The calcium concentration in millimoles per litre.
}
\end{Format}
\begin{Source}\relax
The data were obtained from


Andrews, D.F. and Herzberg, A.M. (1985) 
\emph{Data: A Collection of Problems from Many Fields for the Student and Research Worker}. Springer-Verlag.
\end{Source}
\begin{References}\relax
Davison, A.C. and Hinkley, D.V. (1997) 
\emph{Bootstrap Methods and Their Application}. Cambridge University Press.
\end{References}