subheading" id="Description-28"><span>Description<a class="copiable-link" href="#Description-28"> &para;</a></span></h4>

<p>This is a matched case-control study dating from before the availability of
conditional logistic regression.
</p>
<h4 class="subsubheading" id="Format-27"><span>Format<a class="copiable-link" href="#Format-27"> &para;</a></span></h4>

<dl class="table">
<dt><code class="code">education</code></dt>
<dd><p>Index of the record.
</p></dd>
<dt><code class="code">age</code></dt>
<dd><p>Age 