<p>The tags <a href="https://stats.stackexchange.com/questions/tagged/mixed-model">mixed-model</a> and <a href="https://stats.stackexchange.com/questions/tagged/multilevel-analysis">multilevel-analysis</a> seem to be entirely redundant upon a quick glance at the question lists. Should we only have one tag? (I'm not quite sure what the difference between tag synonyms and merging tags are.)</p>
