interaction contrasts in SPSS?


New Member

My mixed model ANOVA has yielded a significant three way interaction, the factors of which each have two levels. Factors are Time, Training, and Test Item type. Time and Item type are within-participant factors, Training is between.

I'd like to look at the interaction contrast for Time x Training (i.e., Pretest of training A [before training]- posttest for Training A compared to pretest of training B - posttest of training B), but I'm not sure how to do this in SPSS.

My understanding is that this will show that Training A shows better post-training performance on one type of item than Training B does.

If anyone can point me in the right direction, I'd appreciate it.