span class="fu">::</span><span class="fu"><a href="https://rdrr.io/pkg/survival/man/Surv.html" class="external-link">Surv</a></span><span class="op">(</span><span class="va">time</span>, <span class="va">status</span><span class="op">)</span> <span class="op">~</span> <span class="va">age.factor</span> <span class="op">+</span> <span class="va">sex.factor</span> <span class="op">+</span></span></span>
<span class="r-in"><span>  <span class="va">obstruct.factor</span> <span class="op">+</span> <span class="v