h2f1: Use Bruce Hardie's Gaussian hypergeometric implementation
In BTYD: Implementing BTYD Models with the Log Sum Exp Patch

Description Usage Arguments References See Also

In benchmarking pnbd.LL runs more quickly and it returns the same results if it uses this helper instead of hypergeo, which is the default. But h2f1 is such a barebones function that in some edge cases it will keep going until you get a segfault, where hypergeo would have failed with a proper error message.

1	h2f1(a, b, c, z)

`a,`	counterpart to A in `hypergeo`
`b,`	counterpart to B in `hypergeo`
`c,`	counterpart to C in `hypergeo`
`z,`	counterpart to z in `hypergeo`

Fader, Peter S., and Bruce G.S. Hardie. "A Note on Deriving the Pareto/NBD Model and Related Expressions." November. 2005. Web. http://www.brucehardie.com/notes/008/

hypergeo

BTYD documentation built on Nov. 18, 2021, 1:10 a.m.