<p>I believe <a href="https://stats.stackexchange.com/questions/tagged/auc" class="post-tag" title="show questions tagged &#39;auc&#39;" rel="tag">auc</a> should be a synonym for <a href="https://stats.stackexchange.com/questions/tagged/roc" class="post-tag" title="show questions tagged &#39;roc&#39;" rel="tag">roc</a>.  <a href="https://stats.stackexchange.com/questions/tagged/auc" class="post-tag" title="show questions tagged &#39;auc&#39;" rel="tag">auc</a> was created only for <a href="https://stats.stackexchange.com/questions/12309">this question</a>.</p>
