JuliaStats/Distributions.jl — pull request #102 by simonbyrne (2013-07-17 08:14:41+00:00)
Title: various tweaks, rand for noncentral

A couple of tweaks:
* undefined statistics now return NaN or Inf instead of raising an error.
* `FDist` has a mode at 0 if `ndf <= 2.0`
* `InvertedGamma` and `Chi` now have all their quantile and cdf functions defined.
* `rand` methods for noncentral distributions