On Thu, Nov 21, 2013 at 8:31 AM, Greg Reckless <[log in to unmask]> wrote:

Dear FSL list,

I have a 2(condition) x 3(group) mixed-design study. I have created a model and contrasts (attached .png file) based on the 2-way Mixed Effect ANOVA described on the FSL Wiki (http://fsl.fmrib.ox.ac.uk/fsl/fslwiki/GLM#ANOVA:_2-groups.2C_2-levels_per_subject_.282-way_Mixed_Effect_ANOVA.29). For simplicity I have only included 2 subjects per group. Two COPEs from the first-level, representing the two levels of condition, were entered for each subject in the higher-level model.

My questions are as follows:
1) Is this model correct and is it the most appropriate for a 2x3 mixed design?

Yes. Although I would add 2 columns for group for completeness.

2) Are my contrasts correct for testing the main effect of condition (Lvl.1>Lvl.2 and Lvl.2>Lvl.1 and the interaction effect between condition and group?

Interaction contrasts aren't interactions. The interaction would be 0 0 1 -1 0 0 0 ...

The contrast 0 0 1 0 0 0 ... tests if Lvl.1>Lvl.2 is significant in group 1.

Thank you for your input!
Greg