[R] count data with nested mixed effects

[Francisco Zagmutt]

Hi Deborah,

A very good source for hands-on information on mixed models in S is: 
"Mixed-effects models in S and S-PLUS" by Pinheiro and Bates

Incidentally, it's available in your university's library 
http://toroprod.library.utoronto.ca/uhtbin/cgisirsi/2XfWcMI0Ns/ROBARTS/140640080/2/1000

I believe the book does not explicitly cover the lme4 package (lmer is 
part if this package) but the principles can be easily applied to your 
needs.

Regards,

Francisco





kohn at botany.utoronto.ca wrote:
> Dear R-Pros,
> I have count data in which 6-10 points are nested within 17 larger units
> (which are nested within 3 larger-still units) plus a number of
> covariates.  It could be nested ANCOVA but for poisson family.  Could
> someone kindly advise me 1) if lmer is the correct function for the
> analysis? and 2) what synax expresses the error structure?  I have
> consulted the package HTML documentation but am not experienced enough to
> get it.
> Many thanks,
> Deborah
> 
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-- 
Dr. Francisco J. Zagmutt
College of Veterinary Medicine and Biomedical Sciences
Colorado State University