iv>
    </div>

    <div class="ref-description section level2">
    <p>Survival times of 200 fake people.  The cure probability is 0.5
for <code>x=0</code>, and the log odds ratio for cure is 0.5, so that the
cure probability is about 0.62 for <code>x=1</code>.  The uncured population
have survival times distributed as a Weibull with shape 1.5 and
scale 1.2.</p>
    </div>

    <div class="section level2">
    <h2 id="ref-usage">Usage<a class="anchor" aria-label="anchor" href="#ref-usage"></a></h2>
    <di