Hey all,

My design:

3 Groups (between) X 3 Trials (within)

The Problem:

I'm looking for the SPSS (12, 13 or 16) syntax that would allow me to test the Group (quadratic) X Trial (linear) interaction. I know there is a significant quadratic trend of Group and a significant linear trend of Trial but I can't figure out how to test that specific interaction.

Thanks in advance!