<p>We have two tags for intraclass correlation: <a href="https://stats.stackexchange.com/questions/tagged/intraclass-correlation" class="post-tag" title="show questions tagged &#39;intraclass-correlation&#39;" rel="tag">intraclass-correlation</a> (which indexed 40 threads), and <a href="https://stats.stackexchange.com/questions/tagged/icc" class="post-tag" title="show questions tagged &#39;icc&#39;" rel="tag">icc</a> (which indexed 6). I have retagged 5 of the latter (1 was migrated and couldn't be edited), and changed the wiki to indicate that it is a duplicate.  However, I cannot suggest that it is a synonym because I don't have 5 upvotes on <a href="https://stats.stackexchange.com/questions/tagged/intraclass-correlation" class="post-tag" title="show questions tagged &#39;intraclass-correlation&#39;" rel="tag">intraclass-correlation</a>.</p>
