<p>We have the following rank-related tags:</p>

<ul>
<li><a href="https://stats.stackexchange.com/questions/tagged/mann-whitney-u-test" class="post-tag" title="show questions tagged &#39;mann-whitney-u-test&#39;" rel="tag">mann-whitney-u-test</a> (271) -- ranksum test</li>
<li><a href="https://stats.stackexchange.com/questions/tagged/wilcoxon" class="post-tag" title="show questions tagged &#39;wilcoxon&#39;" rel="tag">wilcoxon</a> (297) -- used for ranksum and for signed-rank</li>
<li><a href="https://stats.stackexchange.com/questions/tagged/signed-rank-test" class="post-tag" title="show questions tagged &#39;signed-rank-test&#39;" rel="tag">signed-rank-test</a> (37)</li>
<li><a href="https://stats.stackexchange.com/questions/tagged/sign-test" class="post-tag" title="show questions tagged &#39;sign-test&#39;" rel="tag">sign-test</a> (21)</li>
<li><a href="https://stats.stackexchange.com/questions/tagged/spearman" class="post-tag" title="show questions tagged &#39;spearman&#39;" rel="tag">spearman</a> (134)</li>
<li><a href="https://stats.stackexchange.com/questions/tagged/spearman-rho" class="post-tag" title="show questions tagged &#39;spearman-rho&#39;" rel="tag">spearman-rho</a> (107)</li>
<li><a href="https://stats.stackexchange.com/questions/tagged/kendall-tau" class="post-tag" title="show questions tagged &#39;kendall-tau&#39;" rel="tag">kendall-tau</a> (74)</li>
<li><a href="https://stats.stackexchange.com/questions/tagged/rank-correlation" class="post-tag" title="show questions tagged &#39;rank-correlation&#39;" rel="tag">rank-correlation</a> (101) -- most questions seem to be about Spearman's rho</li>
<li><a href="https://stats.stackexchange.com/questions/tagged/ranking" class="post-tag" title="show questions tagged &#39;ranking&#39;" rel="tag">ranking</a> (357)</li>
<li><a href="https://stats.stackexchange.com/questions/tagged/ranks" class="post-tag" title="show questions tagged &#39;ranks&#39;" rel="tag">ranks</a> (70)</li>
</ul>

<p><strong>Problems:</strong></p>

<ol>
<li><strike><code>[wilcoxon]</code> is ambiguous. Worse, one meaning of <code>[wilcoxon]</code> is synonymous with <code>[mann-whitney-u-test]</code> and another meaning is synonymous with <code>[signed-rank-test]</code>.</strike></li>
<li><strike><code>[spearman]</code> and <code>[spearman-rho]</code> are synonymous.</strike></li>
<li><strike><code>[rank-correlation]</code> might be better off sorted out into specific types.</strike></li>
<li><code>[ranking]</code> and <code>[ranks]</code> have somewhat unclear scope.</li>
</ol>

<hr>

<p><strong>My current proposal is:</strong></p>

<ol>
<li><strike>Create <code>[wilcoxon-rank-sum]</code> and <code>[wilcoxon-signed-rank]</code> tags.</strike> <strong>Done.</strong></li>
<li><strike>Make <code>[wilcoxon-rank-sum]</code> and <code>[mann-whitney-u-test]</code> both synonyms of <code>[wilcoxon-mann-whitney]</code>.</strike> <strong>Done by @Glen_b.</strong></li>
<li><strike>Make <code>[wilcoxon-signed-rank]</code> the synonym of <code>[signed-rank-test]</code>.</strike> <strong>Done by @Glen_b. Later reverted by @Scortchi, following @ttnphns' answer.</strong></li>
<li><strike>Go through all <code>[wilcoxon]</code> questions and move those about rank sum into <code>[wilcoxon-mann-whitney]</code>.</strike> <strong>Done by @mdewey.</strong></li>
<li><strike>Move all the remaining threads from <code>[wilcoxon]</code> into <code>[signed-rank-test]</code> via mod merge hammer.</strike> <strong>Done by @Glen_b.</strong></li>
<li><strike>Merge <code>[spearman]</code> into <code>[spearman-rho]</code>.</strike> <strong>Synonym created via voting. Merge done by @Glen_b.</strong></li>
<li><p><strike>Sort as many questions as possible from <code>[rank-correlation]</code> into <code>[spearman-rho]</code> and/or <code>[kendall-tau]</code> and/or <code>[goodman-kruskal-gamma]</code>. It looks like there will be ~30 questions left though.</strike> <strong>Done. Thanks @mdewey.</strong></p></li>
<li><p>Go through <code>[ranking]</code> and <code>[ranks]</code> and try to understand what to do with them. I leave this open for now because this involves 400+ threads.</p></li>
</ol>
