pan><span class="op">(</span><span class="st">"sex"</span>, <span class="st">"ph.ecog"</span><span class="op">)</span>, controls <span class="op">=</span> <span class="st">"age"</span>, merge_models <span class="op">=</span> <span class="cn">TRUE</span>,</span></span>
<span class="r-in"><span>  drop_controls <span class="op">=</span> <span class="cn">TRUE</span></span></span>
<span class="r-in"><span><span class="op">)</span></span></span>
<span class="r-msg co"><span class="r-pr">#&gt;</span> =&gt; Process