[Developers] incomplete beta function is broken

[dave fournier]

On 12-06-27 10:13 AM, John Sibert wrote:

I tracked the problem down to the gamma(x) function. I replaced it with 
gammln(x) from NR.
derivatives are now correct as far as I checked.




> the package with a slight name change.
> Could use capitals as Betai, Gammln. Then both versions

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