n
</p>
<p><em>number of observations</em> :  40
</p>


<h3>Usage</h3>

<pre><code class='language-R'>data(Accident)</code></pre>


<h3>Format</h3>

<p>A dataframe containing :
</p>

<dl>
<dt>type</dt><dd><p>ship type, a factor with levels (A,B,C,D,E)</p>
</dd>
<dt>constr</dt><dd><p>year constructed, a factor with levels (C6064,C6569,C7074,C7579)</p>
</dd>
<dt>operate</dt><dd><p>year operated, a factor with levels (O6074,O7579)</p>
</dd>
<dt>months</dt><dd><p>measure of service amount</p>
</dd>
<dt>acc</dt><