<p><a href="https://stats.stackexchange.com/review/close/207243">This question</a> was recently closed as duplicate. I agree with this, but the title is now the title of the older question which is more restrictive than that of the new one (the old one is about two groups, the new one is about a collection). </p>

<p>What should be done in cases like this? Should we edit the title of the old question?</p>
