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

    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.

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