Dear all,

I'm a beginner of R and I need to carry out some three-way mixed ANOVAs.
Following examples at http://personality-project.org/r/r.anova.html, I
managed to get the ANOVA part, but I don't know how can I check data
normality and homogeneity of variance in R (since they're the required
assumptions of ANOVA analysis).

Are there any special command/packages? Could anyone give me some
pointers/examples?

Best regards,
Haiyang

-- 
Haiyang AI, Ph.D. student
Department of Applied Linguistics
The Pennsylvania State University

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