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Dummy-Variable Regression

7 Dummy-VariableRegressionOne of the serious limitations of multiple- Regression analysis, as presented in Chapters 5and 6, is that it accommodates only quantitative response and explanatory variables. In thischapter and the next, I will explain how qualitative explanatory variables, calledfactors, can beincorporated into a linear current chapter begins with an explanation of how adummy-variable regressorcan becoded to represent adichotomous( , two-category) factor. I proceed to show how a set of dummyregressors can be employed to represent apolytomous(many-category) factor.

Here, gender is a qualitative explanatory variable (i.e., a factor), with categories male and female. The dummy variable D is a regressor, representing the factor gender. In contrast, the quantitative explanatory variable education and the regressor Xare one and the same. Were we to transform education, however, prior to entering

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