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