<p>I think this type of question is a mixture of "too broad" with "opinion-based"; therefore not on-topic in CV SE. </p>

<blockquote>
  <p>Which forum is most appropriate for stats-centric grad-school related questions?</p>
</blockquote>

<p>Apparently, <a href="https://academia.stackexchange.com/">Academia SE</a>. Their <a href="https://academia.stackexchange.com/help/on-topic">on-topic help page</a> says:</p>

<blockquote>
  <p>What topics can I ask about here?<br>
  ....<br>
  If you have a question about...<br>
  ....<br>
  <strong>- Transitioning from undergraduate to graduate researcher.</strong><br>
  ....<br>
  .. then you're in the right place!</p>
</blockquote>

<p>Additionally, they have tags <a href="https://stats.stackexchange.com/questions/tagged/recommendation-letter" class="post-tag" title="show questions tagged &#39;recommendation-letter&#39;" rel="tag">recommendation-letter</a> and <a href="https://stats.stackexchange.com/questions/tagged/statistics" class="post-tag" title="show questions tagged &#39;statistics&#39;" rel="tag">statistics</a>. A combination of both yielded no results. A search on <a href="https://academia.stackexchange.com/search?tab=votes&amp;q=%5brecommendation-letter%5d%20statistics%20is%3aquestion">[tag:recommendation-letter] + statistics</a> resulted in five questions, but none seemed to be a dupe. Of course, it was just a quick search, which you need to recheck and look deeper. Good luck!</p>
