Dear SPMers,
I want to calculate a 2x2x3 ANOVA in SPM 8 and am in desperate need of your help.
I have factors 1 (anxiety: yes/no) and 2 (depression: yes/no) with two levels each, and factor 3 (difficulty: low/middle/high) with three levels.
I'm interested in main effects of all three factors as well as in all possible interactions and the three-way interaction (anxiety x depression x difficulty).
As far as I've understood by now (by reading tutorials and the manual), I need to do this with a full factorial model since in flexible factorial, you need a subject factor and you can't do three-way interactions, right?
Then, in the full factorial SPM 8 batch, I enter the three factors (with name, levels and independence) and then I need to specify cells. This is the point where I get lost: what is meant by "cell" and by "levels"? What do I enter there? Which of my total scans do I need to enter where?
And is there a nice tutorial on contrast vectors for full factorial models? I've already read the one by Gläscher & Gitelman which helped a lot for flexible factorial models, but not as much for full factorial models (I think)?
I would be really happy about all kinds of answers!
Best regards,
Maria
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