<p>Let me make a concrete proposal so that people can comment and vote.</p>

<p>I propose that we re-tag all the [hauck-donner-effect] ones as [separability] and for at least a selected few of those not tagged with either but which are clearly about separation we tag them [separability] too.</p>

<p>======= edit 29 November 2017 ==========</p>

<p>Following discussion I now propose the new tag [separation] for both of these. For an excerpt I suggest the following, taken and adapted from Wikipedia</p>

<blockquote>
  <p>Separation occurs when some value(s) of a predictor (or linear combination of predictors) is associated with only one value of a categorical outcome.</p>
</blockquote>

<p>I have tried to make this as non-technical as possible but am happy for anyone to edit it (as they can later anyway).</p>
