Hi,
I have to analyse the number of provisioning trips to nestlings according to a
number of biological and environmental factors. I was thinking of building a
mixed-effects model with species and nestid as random effects, using a Poisson
distribution, but the data are overdispersed (variance/mean = 5). I then
thought of using a mixed-effects model with negative binomial distribution, but
I have 2 problems:
1- The only package building mixed models with neg. bin. distribution I found
is the package glmmADMB but I have a hard time understanding the output. Anyone
knows of a R package with an output that gives p values?
2- Two people I asked advice to told me that I should use either a mixed-effect
model with a Poisson distribution (the random effects will take care of the
overdispersion) OR a glm using neg. bin. distribution but not both at the same
time, which would be unnecessary.
Any advice is welcome!
Thank you
Marie-Helene Hachey
M.Sc. student
Universite Laval, Quebec
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