There is a feature request implicit in MATH-1185 - to add direct
computation of (upper) tail probabilities, so users can avoid loss
of significance errors when computing them from cumulative
probabilities, which is the only thing they can do with current
implementations.  In some cases, we can fairly easily provide direct
estimates; in others, not so easy.

What might make sense would be:

*  Add an upperTail(x) method to the 4.0 distributions interface 
(maybe with a better name)
*  Add default implementation to AbstractXxDistribution (3.x and 4)
that returns naive results
*  Add - and doc - better implementations for individual
distributions as and when we get them

Phil


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