="st">"sex.factor"</span>, <span class="st">"obstruct.factor"</span>, <span class="st">"perfor.factor"</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="va">random_effect</span> <span class="op">=</span> <span class="st">"hospital"</span></span></span>
<span class="r-in"><span><span class="va">dependent</span> <span class="op">=</span> <span class="st">"nodes"</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="va">colon_s</spa