>do_ci</span> <span class="op">&lt;-</span> <span class="kw">function</span><span class="op">(</span><span class="va">df</span>, </span>
<span>                  <span class="va">event_date</span>,</span>
<span>                  <span class="va">response</span> <span class="op">=</span> <span class="st">"Organic Search"</span>,</span>
<span>                  <span class="va">predictors</span> <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span>