Hi,

Even after reading the various help files, I donšt really understand the
formatting of the grouping factor.

My model is z ~ x*y with 1 grouping factor. I wish to compare models with
only an intercept random effect, random effects for intercept and x, random
effects for intercept and y, random effects for intercept plus x and y
(independent and not independent), and random effects for all fixed effects
(independent and not independent).

My data frame has 360 rows with 24 levels of the grouping factor

> sessionInfo()
R version 2.5.1 (2007-06-27)
i386-apple-darwin8.9.1

locale:
en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] "stats"     "graphics"  "grDevices" "utils"     "datasets"  "methods"
"base"     

other attached packages:
        lme4       Matrix      lattice
 "0.99875-4" "0.999375-0"     "0.16-2"

Insights will be appreciated.

Nathan
-- 
Nathan Leon Pace, MD, MStat
University of Utah
n.l.pace@utah.edu
W: 801.581.6393
F: 801.581.4367
M: 801.205.1019




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