<p><a href="https://en.wikipedia.org/wiki/Cronbach&#39;s_alpha" rel="nofollow noreferrer">Cronbach's $\alpha$</a> is an estimate of the reliability of a psychometric test. It's admittedly rather field-specific, and I don't think many people outside of psychology or psychometrics have ever heard of it. Nevertheless, it and its properties seem to be squarely on topic as CV.</p>

<p><a href="https://stats.stackexchange.com/search?q=cronbach+is%3Aq">And we have no less than <em>149 questions on it</em>.</a> But no tag.</p>

<p>Skimming through the first couple of questions, it seems like few questions mention Cronbach's $\alpha$ but would not profit from the tag. (Little wonder, since it's a rather specific thing.) Thus, I propose that:</p>

<ol>
<li>We create a tag <a href="https://stats.stackexchange.com/questions/tagged/cronbachs-alpha" class="post-tag" title="show questions tagged &#39;cronbachs-alpha&#39;" rel="tag">cronbachs-alpha</a>.</li>
<li>Some Higher Being (moderator? SE developer?) mass-retags-without-bumping all questions that contain "Cronbach's alpha", perhaps looking specifically at those questions that already have the five maximum tags.</li>
</ol>

<p>I'll post a couple of possible actions. Please upvote whatever seems best to you.</p>
