<p>I think in this particular case it would be a good edit, <strike>but mainly</strike> especially because the title "MLE in layman terms" is otherwise very short; there is some room to expand it. Go ahead and replace it with "Maximum likelihood estimation (MLE) in layman terms", why not!</p>

<p><strike>But often</strike> Sometimes titles with abbreviations are quite long already, and then I would be reluctant to replace e.g. "PCA" by "principal component analysis (PCA)" -- and  even occasionally make <em>an opposite</em> edit, for the sake of brevity. I do always try to make sure, however, that the abbreviation is spelled out in the question body (and occasionally edit solely for this purpose).</p>

<p>In this case it was ("MLE" was fully spelled out); so I am not sure I understand why you failed to find it via search. What did you search for?</p>
