fgl {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

    fgl

### Format

This data frame contains the following columns:

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

  The next 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.

[Package MASS version 7.2-45 Index]