I'm trying to run ANCOVA in SPSS, with a continuous IV as well as a continuous covariate.
- 1 DV: Continuous
- 2 IVs: 1 Continuous and 1 Categorical
- 1 Covariate: Continuous
I am most interested on the interaction of the 2 IVs on the DV.
My question: Do I need to enter the continuous variable into the "covariate" box in SPSS. In that case, do I then change from the "full factorial" model to a "custom" model where I select main effects of each IV and covariate, as well as the interaction of the 2 IVs? or something else?