Dear all,

I have a question regarding the definition of the negative binomial distribution. See the current draft (https://github.com/cplusplus/draft/releases/download/n4861/n4861.pdf) 26.6.8.3.4 (p 1177).

The parameter k is specified as IntType, hence it cannot be used for real positive parameters k, which would be completely valid from a mathematical point of view.

This makes it unusable for practical purposes, e.g. for claim modelling in insurance as there the claim number distribution may be negative binomial with non integer parameter k.

Implementation wise it does not make much difference, e.g. in the Microsoft STL implementation it is even casted back to double, see https://github.com/microsoft/STL/blob/master/stl/inc/random code line 4310.

I guess the other implementations also use the Poisson Gamma mixture as described in http://www.eirene.de/Devroye.pdf page 488, example 1.5.

What are the steps I can do to try to change this definition in the standard?

Thank you

Best regards

Max