[R] Help with three-way anova

[Federico Calboli]

On Tue, 2005-04-05 at 15:51 +0100, michael watson (IAH-C) wrote:

> So, what I want to know is:
> 
> 1) Given my unbalanced experimental design, is it valid to use aov?

I'd say no. Use lm() instead, save your analysis in an object and then
possibly use drop1() to check the analysis

> 2) Have I used aov() correctly?  If so, how do I get access results for
> interactions?

The use of aov() per se seems fine, but you did not put any interaction
in the model... for that use factor * factor.

HTH,

F

-- 
Federico C. F. Calboli
Department of Epidemiology and Public Health
Imperial College, St Mary's Campus
Norfolk Place, London W2 1PG

Tel  +44 (0)20 7594 1602     Fax (+44) 020 7594 3193

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