Question

Asked Dec 31, 2019

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Fill in the blanks.

a. The cross-product term in a regression equation is often referred to as an______term.

b. If two predictor variables x1 and x2 interact, then the change in the conditional mean of y for a change of one unit in x2 (with x1 held xed) depends on_______.

c. In a regression model, the cross-product term between x1 and x2 is given by_______.

Step 1

a)

The interaction between two variables is calculated separately, because the combined effect of the predictors is not always the simple additive effect. The interaction is obtained by finding the cross-product between the variables.

Step 2

Thus, the cross-product term in a regression equation is often referred to as an **interaction** term.

b)

The combined effect of the predictors is not always the simple additive effect, but is an effect that causes differences in the slope of th...

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