ss="external-link">c</a></span><span class="op">(</span><span class="st">"AUC"</span>, <span class="st">"R2"</span>, <span class="st">"D"</span><span class="op">)</span><span class="op">)</span> <span class="op"><a href="https://winvector.github.io/wrapr//reference/dot_arrow.html" class="external-link">%.&gt;%</a></span></span></span>
<span class="r-in"><span>    <span class="fu"><a href="extend.html">extend</a></span><span class="op">(</span><span class="va">.</span>, <span class="va">c</span> <span class=