[R] Density plot with lattice?

[Marie-Hélène Hachey]

Hi,
Is it possible to remove the points at the base of a density plot?I would like 
to keep only the curves of the plot, not the points.
Thank you.
Marie-Helene HacheyM.Sc. studentUniversite Laval, Quebec
  
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[R] Mixed-effects model for overdispersed count data?

[Marie-Hélène Hachey]

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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and provide commented, minimal, self-contained, reproducible code.