[ADMB Users] glmmadmb, nbinom and alpha

Lars Qviller lars.qviller at ibv.uio.no
Thu Aug 22 02:26:57 PDT 2013

Dear admb users.

I am trying to extract scaled residuals from a truncated negative 
binomial model using glmmadmb. I understand that it is possible to 
parameterize a negative binomial model in different ways. My two 
questions are:
Is the negative binomial dispersion parameter in the ountput the same as 
is used to scale the residuals with the formula:

(y-fitted(mod))/sqrt(fitted(mod)+ mod$alpha*fitted(mod)^2)

where "y" is the response of the fitted model "mod"?

2) is the formula correct?

Best regards
Lars Qviller
PhD student in ecology
Centre for Ecological and Evolutionary Synthesis (CEES)
University of Oslo

More information about the Users mailing list