For normality check out: ?shapiro.test
HTH!
Schalk

On Tue, Jan 5, 2010 at 5:32 AM, Haiyang AI <aihaiyang@gmail.com> wrote:

> 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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>
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