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% file MASS/man/fgl.Rd
% copyright (C) 1994-9 W. N. Venables and B. D. Ripley
%
\name{fgl}
\alias{fgl}
\title{
Measurements of Forensic Glass Fragments
}
\description{
The \code{fgl} data frame has 214 rows and 10 columns.
It was collected by B. German on fragments of glass
collected in forensic work.
}
\usage{
fgl
}
\format{
This data frame contains the following columns:
\describe{
\item{\code{RI}}{
refractive index; more precisely the refractive index is 1.518xxxx.
The next 8 measurements are percentages by weight of oxides.
}
\item{\code{Na}}{sodium.}
\item{\code{Mg}}{manganese.}
\item{\code{Al}}{aluminium.}
\item{\code{Si}}{silicon.}
\item{\code{K}}{potassium.}
\item{\code{Ca}}{calcium.}
\item{\code{Ba}}{barium.}
\item{\code{Fe}}{iron.}
\item{\code{type}}{
The fragments were originally classed into seven types, one of which
was absent in this dataset. The categories which occur are
window float glass (\code{WinF}: 70),
window non-float glass (\code{WinNF}: 76),
vehicle window glass (\code{Veh}: 17),
containers (\code{Con}: 13),
tableware (\code{Tabl}: 9) and
vehicle headlamps (\code{Head}: 29).
}
}
}
\references{
Venables, W. N. and Ripley, B. D. (2002)
\emph{Modern Applied Statistics with S.} Fourth edition. Springer.
}
\keyword{datasets}
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