Which of the following regression models does not include an interaction variable? A) y = β₀ + β₁x + β₂xd + ε B) y = β₀ + β₁x + β₂d + ε C) y = β₀ + β₁d + β₂xd + ε D) y = β₀ + β₁x + β₂d + β₃xd + ε

Question

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Model B is the only one that does not include an interaction variable (i.e. a variable that multiplies two or more other variables). All the other models include at least one interaction variable (e.g. ₁x).

Which of the Following Regression Models Does Not Include an Interaction