[ADMB Users] Relationship between NB in ADMB and NB in R

[Mollie Brooks]

Hi Mark,
In negbinomial_density, r=mu/(tau-1) (with a little robustification to keep from dividing by zero. r is then used as the size parameter.

In dnbinom in the contributed stats libraries, Steve and I parametarized the function in terms of size (i.e. k). However, it returns the negative log likelihood.
http://admb-project.org/documentation/api/dnbinom_8cpp.html

cheers,
Mollie


On 11 Feb 2012, at 3:19 PM, Mark Maunder wrote:

> How does the tau parameter in the ADMB negative binomial relate to the size parameter in R’s dnbinom(x, size, prob, mu, log = FALSE) function?
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