fgl                   package:MASS                   R Documentation

Measurements of Forensic Glass Fragments

Description:

     The 'fgl' data frame has 214 rows and 10 columns. It was collected
     by B. German on fragments of glass collected in forensic work.

Usage:

     data(fgl)

Format:

     This data frame contains the following columns:

     'RI' refractive index; more precisely the refractive index is
          1.518xxxx.

          The remaining 8 measurements are percentages by weight of
          oxides.

     'Na' sodium

     'Mg' manganese

     'Al' aluminium

     'Si' silicon

     'K' potassium

     'Ca' calcium

     'Ba' barium

     'Fe' iron

     '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 ('WinF': 70), window non-float
          glass ('WinNF': 76), vehicle window glass ('Veh': 17),
          containers ('Con': 13), tableware ('Tabl': 9) and vehicle
          headlamps ('Head': 29).

References:

     Venables, W. N. and Ripley, B. D. (2002) _Modern Applied
     Statistics with S._ Fourth edition.  Springer.

