hello R help
I am trying to analyze a data set that has been collected from a
hierarchical sampling design. The model should be a mixed model nested
ANOVA. The purpose of my study is to analyze the variability at each
spatial scale in my design (random factors, variance components), and say
something about the variability between regions (fixed factor, contrast of
means). The data is as follows;
region (fixed)
Location (random)
Site(random)
site nested in location nested in region.
I would like to run this as an ANOVA and then compute variance components.
My question is when i use the aov command; mod1 <- aov(density ~
region/location/site)
is there any way to tell R which factor is random and fixed.
I know i can specify fixed and random factors using lme or lmer but these
methods do not allow me to extract an anova table (or do they?)
I know that the data can be analyzed using a nested ANOVA because i have
based my design on several papers in the marine biological literature
(MEPS). Thank-you for any advice in advance.
Stephen Cole
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