An Example of the Interaction Term Between Two Independent, Continuous

An example of the interaction term between two independent, continuous variables is a. $\quad Y _ { i } = \beta _ { 0 } + \beta _ { 1 } X _ { i } + \beta _ { 2 } D _ { i } + \beta _ { 3 } \left( X _ { i } \times D _ { i } \right) + u _ { i }$ .
b. $Y _ { i } = \beta _ { 0 } + \beta _ { 1 } X _ { 1 i } + \beta _ { 2 } X _ { 2 i } + u _ { i }$ .
c. $Y _ { i } = \beta _ { 0 } + \beta _ { 1 } D _ { 1 i } + \beta _ { 2 } D _ { 2 i } + \beta _ { 3 } \left( D _ { 1 i } \times D _ { 2 i } \right) + u _ { i }$ .
d. $Y _ { i } = \beta _ { 0 } + \beta _ { 1 } X _ { 1 i } + \beta _ { 2 } X _ { 2 i } + \beta _ { 3 } \left( X _ { 1 i } \times X _ { 2 i } \right) + u _ { i }$ .

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