<p>Here is my specific plan about what to do  with the <a href="https://stats.stackexchange.com/questions/tagged/pearson" class="post-tag" title="show questions tagged &#39;pearson&#39;" rel="tag">pearson</a> tag, based on the above discussion with @Scortchi a year ago:</p>

<ol>
<li>Create tags and tag synonyms <a href="https://stats.stackexchange.com/questions/tagged/pearson-chi-squared" class="post-tag" title="show questions tagged &#39;pearson-chi-squared&#39;" rel="tag">pearson-chi-squared</a>$\to$<a href="https://stats.stackexchange.com/questions/tagged/chi-squared" class="post-tag" title="show questions tagged &#39;chi-squared&#39;" rel="tag">chi-squared</a> and <a href="https://stats.stackexchange.com/questions/tagged/pearson-goodness-of-fit" class="post-tag" title="show questions tagged &#39;pearson-goodness-of-fit&#39;" rel="tag">pearson-goodness-of-fit</a>$\to$<a href="https://stats.stackexchange.com/questions/tagged/chi-squared" class="post-tag" title="show questions tagged &#39;chi-squared&#39;" rel="tag">chi-squared</a>. <strong>Update: DONE.</strong></li>
<li><p>Go through all [pearson] threads and retag those about chi-squared into <a href="https://stats.stackexchange.com/questions/tagged/chi-squared" class="post-tag" title="show questions tagged &#39;chi-squared&#39;" rel="tag">chi-squared</a>. This will be a minority of [pearson] threads, so not very difficult. <strong>Update: DONE.</strong></p>

<p>Specifically, I looked at all questions that:</p>

<ul>
<li>had "chi" in them; or</li>
<li>had "goodness" in them; or</li>
<li>had "residual" or "residuals" in them; or</li>
<li>did <em>not</em> have "correlation" in them.</li>
</ul>

<p><br><strong>I retagged a couple of dozens, the remaining 263 must  be all about Pearson's $r$.</strong> </p></li>
<li><p>Rename <a href="https://stats.stackexchange.com/questions/tagged/pearson" class="post-tag" title="show questions tagged &#39;pearson&#39;" rel="tag">pearson</a> into <a href="https://stats.stackexchange.com/questions/tagged/pearson-r" class="post-tag" title="show questions tagged &#39;pearson-r&#39;" rel="tag">pearson-r</a> via a mod merge hammer: make a synonym, merge, delete the synonym mapping. (This is needed to remove the ambiguity of the <code>[pearson]</code> tag name). <strong>Update: DONE by @Scortchi.</strong></p></li>
<li>Profit.</li>
</ol>
