p">C_samp<a class="anchor" aria-label="anchor" href="#arg-c-samp"></a></dt>
<dd><p>A <code>numeric</code> vector of observed values of the indicator
for inclusion in the second-phase sample.</p></dd>


<dt id="arg-fit-type">fit_type<a class="anchor" aria-label="anchor" href="#arg-fit-type"></a></dt>
<dd><p>A <code>character</code> indicating whether to perform the fit
using GLMs or a Super Learner ensemble model. If use of Super Learner is
desired, then the argument <code>sl_learners</code> must be provided