[R] Hierarchical ANOVA

[joris.dewolf at cropdesign.com]

Romain,

Look for info on mixed models.
In R you do this either with the library nlme or lme4.

A good starting point is an article by Doug Bates in Rnews
http://cran.r-project.org/doc/Rnews/Rnews_2005-1.pdf

Joris


r-help-bounces at stat.math.ethz.ch wrote on 13/02/2007 17:16:41:

>
> Hello,
>
> Does somebody could help me in the computation(formulation) of a
> hierarchical ANOVA using linear model in R?
> I'm working in a population biology study of an endangered species. My
aim
> is to see if I have effects of "Density of individuals/m2" on several
> measured plants fitness traits.
>
> As independent variables I have:
>
> Humidity (continuous)
> Nutritive substance (continuous)
> LUX (continuous)
> Density of individuals/m2 (continuous)
> Population (categorical)
> Year (categorical)
>
> I want to test the 4 continous variables with Population as error term.
And
> the Population, the Year and interaction term, with the error of
Population
> x Year.
>
> Thank you for any help, best regards.
>
> Romain Mayor
>
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