[ADMB Users] negative binomial density

[Mark Maunder]

I think var = u*(1+u/alpha)=u*tau  (e.g. tau = 1.0+ u/alpha);
So you use loglike=log_negbinomial_density(Obs,u,tau);

-----Original Message-----
From: users-bounces at admb-project.org [mailto:users-bounces at admb-project.org] On Behalf Of Mollie Brooks
Sent: Monday, January 02, 2012 12:31 PM
To: John Sibert
Cc: ADMB Users
Subject: Re: [ADMB Users] negative binomial density

I wrote the documentation that is there. I'm not familiar with this parameterization, so I left out the details and only filled in the formulas I read in the code. I'll look at it more carefully and ask Dave what he would say about the code he wrote. Then I'll try to remember how to use doxygen.

cheers,
Mollie

Mollie Brooks
Ph.D. Candidate
NSF IGERT Fellow
Biology Department
University of Florida
mbrooks at ufl.edu
http://people.biology.ufl.edu/mbrooks




On 2 Jan 2012, at 1:42 PM, John Sibert wrote:

> I note that the documentation of the negative binomial density 
> functions at http://admb-project.org/documentation/api/group__PDF.html
> is incomplete. Also the the  "overdispersion" parameter appears to be scaled to the expected value.
> 
> It would be helpful if someone would complete the documentation and provide some rationale for the "r" variable.
> 
> Thanks,
> John
> --
> 
> John Sibert
> Emeritus Researcher, SOEST
> University of Hawaii at Manoa
> 
> Visit the ADMB project http://admb-project.org/
> 
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