This distribution includes the Erlang and Chi-Square distributions as special cases.
Parameters: Location (L), Scale (s), Shape ( )
When is less than 1, Vaduva’s rejection from a Weibull density.
When is greater than 1, Best’s rejection from a t density with 2 degrees of freedom.
When = 1, inverse transformation.
Method 2: Rational Fraction Approximation method with a Newton Polish step
Comment: This method is used instead of Method 1 when Latin Hypercube sampling is in effect.