[ADMB Users] gradient_structure problem with nbinom glmm.admb in R

Mollie Brooks mbrooks at ufl.edu
Sun Jun 12 04:23:12 PDT 2011

Hi Rafael,
You might be miss-specifying your model.
You may want 

> mix<-glmm.admb(dur~1,random=~1,group="id",data=dat,family="nbinom",easyFlag=FALSE,verbose=TRUE)

This would make an intercept only model but allow the different levels of "id" to vary in their intercept. Depending on your experimental design, this might be what you want. What relationship were you hoping the model to represent?

Mollie Brooks
Ph.D. Candidate
Biology Department
University of Florida
mbrooks at ufl.edu

On 12 Jun 2011, at 7:04 AM, Rafael Mares wrote:

> Dear all
> I am trying to run the following model using glmmADMB (ver. 0.5-2) in
> R (ver. 2.13.0) in a linux terminal:
> rmix<-glmm.admb(dur~1,random=~group,group="id",data=dat,family="nbinom",easyFlag=FALSE,verbose=TRUE)
> and I get the following error message:
> Current maximum number of independent variables is 50000
>  You need to increase the global variable MAX_NVAR_OFFSET to 58531
>  This can be done by putting the line
>    'gradient_structure::set_MAX_NVAR_OFFSET(58531);'
>  before the declaration of the gradient_structure object.
> Error in glmm.admb(dur ~ 1, random = ~group, group = "id", data = dat,  :
>  The function maximizer failed
> I've done some reading, mainly on the admb-project website and posts
> on this mailing list, and tried modifying the 'gradient_structure'
> line in the TOP_OF_MAIN_SECTION in the nbmm.tpl file in my R library,
> as I think is suggested... but I get the same error message as if
> nothing had been changed. I would greatly appreciate it if someone
> could clarify if I'm doing something wrong, or if it actually isn't
> possible to change the gradient_structure when running glmmADMB
> through R. By the way, I have no problems running the same model with
> "random=~1".
> Thank you in advance for any help.
> All the best,
> Raff
> --
> Rafael Mares
> Large Animal Research Group (LARG)
> Department of Zoology
> University of Cambridge
> Downing Street
> Cambridge
> CB2 3EJ
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> Users at admb-project.org
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