1. Interactions: IVs = continuous & continuous IVs = continuous & categorical

2. What we already know…  Interactions: IVs = categorical & categorical

3. Interactions (continuous)

4.  Can be done in SPSS with some tweaking:  Center the variables (X minus mean)  Create interaction term (multiple them together)  Put all three variables into “regression” V1 centered V2 centered V3 = new interaction “variable”

5. Multiple Regression

6. Graphs  You can tweak SPSS some more to create “graphs” of “+1SD” and “-1SD” but very tedious.  I would recommend this software: http://www.danielsoper.com/Interaction/default.aspx  Costs $5. Super easy. Gives both “output” and “graphs”. I’ll show you how to use it when you want to run interactions on your data