Thanks for your email.
I think this issue was addressed in a recent posting on the SPM email
list by Jan Glascher (17 Mar). See:
He has written a very good tutorial on this issue which you should be
able to download via the above link (or email Jan directly).
MCLAREN, Donald wrote:
> I was talking to Karl today about 3 way ANOVAs and why they weren't
> available in SPM. He couldn't think of any reason, but suggested that I
> contact you about the issue.
> Is there any reason one can't construct a repeated measures ANOVA with 2
> within-subject factors and group factor for 2 or more groups. In the
> simple case of a 2x2x3 ANOVA; you'd have 4 columns for factor1*factor2,
> 6 columns for factor1*factor3, and 12 columns for
> factor1*factor2*factor3. NOTE: since this is repeated measures design,
> there would also be a term for each subject. Granted this is a huge
> number of columns, is there any reason that this can't be performed,
> either theoretically or practically? Might this option for three-way
> interactions be included in SPM8?
> Any thoughts would be appreciated.
> Best Regards, Donald McLaren
> D.G. McLaren
> University of Wisconsin - Madison
> Neuroscience Training Program
> Tel: (773) 406 2464
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Wellcome Trust Centre for Neuroimaging
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