Help with three-way anova
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 f.calboli [.a.t] imperial.ac.uk f.calboli [.a.t] gmail.com