 <h2 id="author">Author<a class="anchor" aria-label="anchor" href="#author"></a></h2>
    <p>Luca Scrucca</p>
    </div>

    <div class="section level2">
    <h2 id="ref-examples">Examples<a class="anchor" aria-label="anchor" href="#ref-examples"></a></h2>
    <div class="sourceCode"><pre class="sourceCode r"><code><span class="r-in"><span><span class="co"># data from Wetherill and Brown (1991) pp. 212--213, 216--218:</span></span></span>
<span class="r-in"><span><span class="va">x</span>  <span class="op"