<code>class</code></dt><dd><p>wage class: a factor with levels <code>A</code> <code>B</code> <code>C</code></p>
</dd>
<dt><code>trade</code></dt><dd><p>a factor with levels <code>baker</code> <code>barman</code> <code>billposter</code> ...  <code>wellsinker</code> <code>wireworker</code></p>
</dd>
<dt><code>sober</code></dt><dd><p>the number of non-drinkers, a numeric vector</p>
</dd>
<dt><code>drinks</code></dt><dd><p>the number of drinkers, a numeric vector</p>
</dd>
<dt><code>wage</code></dt><dd><p>weekl