n>  <span class="va">age.factor</span> <span class="op">+</span> <span class="va">sex.factor</span> <span class="op">+</span> <span class="va">obstruct.factor</span> <span class="op">+</span> <span class="va">perfor.factor</span>,</span></span>
<span class="r-in"><span>  data<span class="op">=</span><span class="va">colon_s</span>, family<span class="op">=</span><span class="st">"binomial"</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="va">fit</span> <span class="op"><a 