Testing Interactions: Moderated Regression • A moderator (Z) is a variable that affects the strength and/or direction of the relationship between an independent variable (X) and a dependent variable (Y). • Moderation is also known as an interaction. • Linear regression is the most common way to test for moderation.
I demonstrate how to test an interaction (moderator) hypothesis via multiple regression. I use a centering methodology to reduce multicolinearity. Additional...
G89. 2229 Multiple Regression Week 7 (Wednesday). Statistical interaction Extended Example Considering alternative models. G89.2229 Lect 7W Representing Interaction in the Regression Equation If we believe that the effect of X1 varies as a function of level of a second variable, X2, we can build a simple multiplicative interactive effect.
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