# [R] Negative Binomial Regression - glm.nb

Rolf Turner rolf.turner at xtra.co.nz
Thu Feb 28 21:49:16 CET 2013

On 02/28/2013 08:27 PM, Martin Spindler wrote:
> Dear all,
>
> I would like to ask, if there is a way to make the variance / dispersion parameter $\theta$ (referring to MASS, 4th edition, p. 206) in the function glm.nb dependent on the data, e.g. $1/ \theta = exp(x \beta)$ and to estimate the parameter vector $\beta$ additionally.
>
> If this is not possible with glm.nb, is there another function / package which might do that?

I believe that the VGAM package is designed precisely to do this sort of
thing.

cheers,

Rolf Turner