Re: [Rd] Patch to add Beta binomial distribution. Mentor needed!

From: Joan Maspons <j.maspons_at_creaf.uab.cat>
Date: Fri, 01 Jun 2012 20:36:33 +0200

2012/6/1 Tim Triche, Jr. <tim.triche_at_gmail.com>

> It's in VGAM, remember? Not a bug.
>
> --
> *A model is a lie that helps you see the truth.*
> *
> *
> Howard Skipper<
http://cancerres.aacrjournals.org/content/31/9/1173.full.pdf>
>
>

Yes, it's a wish, not a bug. I would like a faster implementation in c and including quantile function. pbetabin calls qbetabin and sums from 0 to q using a loop. It can be avoided using genhypergeo function from hypergeo package [1] but it adds a dependency and for some parameters it doesn't converge.

In the other hand I think that these functions should be implemented in a more neutral place to avoid that packages interested in this distribution have to depend on VGAM. I'm also interested in the Beta negative binomial distribution which I think it's not implemented (this will be the second round). And last but not least I want to learn.

Yours,

-- 
Joan Maspons
CREAF (Centre de Recerca EcolÚgica i Aplicacions Forestals)
Universitat AutÚnoma de Barcelona, 08193 Bellaterra (Barcelona), Catalonia
Tel +34 93 581 2915            j.maspons_at_creaf.uab.cat
http://www.creaf.uab.cat


[1] https://stat.ethz.ch/pipermail/r-devel/2012-March/063560.html

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