crossed effects with lmer but correlation structure with lme

Denis Vile<denis.vile at ...>  writes:

Hi all,

Was my problem not sufficiently well exposed or no one could help me ?

Sincerely,

Denis

   The canonical reference for this is p. 163ff of Pinheiro
and Bates 2000 (section 4.2.2,  http://tinyurl.com/crossedRE )
You are correct that lme4 doesn't handle 'R-side' correlation
structures, nor will it in the near future ...


  (I've added this information to glmm.wikidot.com/faq ...)

   Ben Bolker

Le 29/03/2012 10:09, Denis Vile a ?crit :

Dear R users,

I'm trying to fit a crossed-effects mixed model that would include a
spatial correlation structure..
The data come from four controlled experiments (control, treatment1,
treatment2, treatment1+treatment2) on plants grown in a growth
chamber.  Individual replicates of different genotypes were grown
together and response traits were measured. A covariate X is included
in the model with a quadratic form.

We fitted the following model using lmer:

fm1<- lmer(Y ~ 1 + Trt1*Trt2*poly(X, degree=2, raw=T) +
(1|idGenotype) + (1|Trt2:idGenotype) + (1|Trt1:idGenotype) +
             (1|Trt1:Trt2:idGenotype), data=...)

   [snip snip snip]