tps://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="fl">0</span>, <span class="fl">14.5</span><span class="op">)</span><span class="op">)</span></span>
<span><span class="va">jointFit2</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rdrr.io/r/stats/update.html" class="external-link">update</a></span><span class="op">(</span><span class="va">jointFit1</span>, functional_forms <span class="op">=</span> <span class="va">form_splines</span>