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<table width="100%" summary="page for fgl {MASS}"><tr><td>fgl {MASS}</td><td align="right">R Documentation</td></tr></table>
<h2>Measurements of Forensic Glass Fragments</h2>


<h3>Description</h3>

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


<h3>Usage</h3>

<pre>
fgl
</pre>


<h3>Format</h3>

<p>
This data frame contains the following columns:
<dl>
<dt><code>RI</code></dt><dd>refractive index; more precisely the refractive index is 1.518xxxx.
</p>
<p>
The remaining 8 measurements are percentages by weight of oxides.
</dd>
<dt><code>Na</code></dt><dd>sodium
</dd>
<dt><code>Mg</code></dt><dd>manganese
</dd>
<dt><code>Al</code></dt><dd>aluminium
</dd>
<dt><code>Si</code></dt><dd>silicon
</dd>
<dt><code>K</code></dt><dd>potassium
</dd>
<dt><code>Ca</code></dt><dd>calcium
</dd>
<dt><code>Ba</code></dt><dd>barium
</dd>
<dt><code>Fe</code></dt><dd>iron
</dd>
<dt><code>type</code></dt><dd>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</code>: 70),
window non-float glass (<code>WinNF</code>: 76),
vehicle window glass (<code>Veh</code>: 17),
containers (<code>Con</code>: 13),
tableware (<code>Tabl</code>: 9) and
vehicle headlamps (<code>Head</code>: 29).
</dd></dl>

<h3>References</h3>

<p>
Venables, W. N. and Ripley, B. D. (2002)
<EM>Modern Applied Statistics with S.</EM> Fourth edition.  Springer.
</p>



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