A mean-centered version of Equation 11 can also be formulated as: (12)Y=B0*+B1*X1*+B2*D2+B3*(X1*·D2)+E where asterisks on regression weights indicate they are for mean-centered predictors, and other symbols were defined above. Only the quantitative predictor X1 was mean-centered; centering the dummy variable D2 would lead to a less interpretable set of regression weights.
