GeneralizedInverseGaussian
                        Generalized inverse Gaussian distribution
Gumbel                  Gumbel distribution
Hyperexponential        Hyperexponential distribution
InverseGamma            Inverse Gamma distribution
InverseGaussian         Inverse Gaussian distribution
NormalInverseGaussian   Normal-inverse Gaussian distribution
SkewNormal              Skew normal distribution
Student                 Non-central Student distribution
findChi2df              Find degrees of freedom
findChi2ncp             Find non-centrality parameter
