or with levels
<code>M</code> and <code>F</code></p>
</dd>
<dt><code>item</code></dt><dd><p>the item on the questionaire, as a factor</p>
</dd>
<dt><code>resp</code></dt><dd><p>the subject's response to the item - an ordered
factor with levels <code>no</code> &lt; <code>perhaps</code> &lt; <code>yes</code></p>
</dd>
<dt><code>id</code></dt><dd><p>the subject identifier, as a factor</p>
</dd>
<dt><code>btype</code></dt><dd><p>behavior type - a factor with levels
<code>curse</code>, <code>scold</code> and <co