>
<span class="r-in"><span> formula <span class="op">=</span> <span class="va">Chronic</span> <span class="op">~</span> <span class="va">Gender</span> <span class="op">+</span> <span class="va">Pain</span> <span class="op">+</span> <span class="va">Tampascale</span> <span class="op">+</span> </span></span>
<span class="r-in"><span> <span class="va">Smoking</span> <span class="op">+</span> <span class="va">Function</span> <span class="op">+</span> <span class="va">Radiation</span> <span class="op">+</span>