I'm trying to use the Flexible-factorial approach in SPM5 to conduct a 3 (Group) x 2 (Instruction) x 2 (Accuracy) mixed-model ANOVA. But I'm having a hard time isolating my conditions in my design matrix in a way to allow such a 3-way analysis to occur.
Indeed, the main effect/interaction option within the Flexible Factorial design options only allows for the set-up of a 2 x 2 interaction. So I can create a Group x Instruction interaction and a Group x Accuracy interaction....but I'm having a hard time figuring out how to do the 3-way analysis.
Is there a way to conduct such a 3-way analysis?
Thanks all,
Matt
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