<p>I propose:  </p>

<ol>
<li>We create a new tag <code>[sensitivity-specificity]</code>, as @amoeba suggested.  We make the existing tags, <a href="https://stats.stackexchange.com/questions/tagged/sensitivity" class="post-tag" title="show questions tagged &#39;sensitivity&#39;" rel="tag">sensitivity</a> and <a href="https://stats.stackexchange.com/questions/tagged/specificity" class="post-tag" title="show questions tagged &#39;specificity&#39;" rel="tag">specificity</a> synonyms of this and merge them.  (We will first need to ensure that the threats tagged with <a href="https://stats.stackexchange.com/questions/tagged/sensitivity" class="post-tag" title="show questions tagged &#39;sensitivity&#39;" rel="tag">sensitivity</a> are correct, of course.)  Note that we have a tag for <a href="https://stats.stackexchange.com/questions/tagged/precision-recall" class="post-tag" title="show questions tagged &#39;precision-recall&#39;" rel="tag">precision-recall</a>, so combining has some precedent.  </li>
<li>We create a tag for <code>[sensitivity-index]</code>, and make it a synonym of <code>[d-prime]</code>.  </li>
<li>I think the excerpt for <code>[sensitivity-analysis]</code> is largely correct (cf., my answer here: <a href="https://stats.meta.stackexchange.com/a/5249/7290">Wiki excerpt for [sensitivity-analysis] tag?</a>), but the excerpt could possibly be clarified.  </li>
</ol>
