Sociology 481 - The University of New Mexico
Sociology 481
Dummy Variable Assignment
This assignment is designed to emphasize the importance of creating dummy variables.
Take your dependent variable and select a categorical independent variable (three or more categories will work best).
Step one:
Run a regression using the chosen dependent variable and independent variable.
Discuss the limitations of it (both logically and statistically), and the reasons that dummy variables are necessary in this case.
Step two:
Create dummy variables for the independent variable and run the regression using the dependent variable and dummy variables you just created.
Step three:
Write the unstandardized regression equation, and interpret it. Be sure to answer the following question:
Do the estimated coefficients mean the same as those in regressions with continuous variables? If not, what do they mean?
Step four:
Assign a value to the original independent variable, and predict the value of your dependent variable using the regression equation.
Note: Be sure to use N-1 (the independent variable has N categories) dummy variables in the regression. When discussing the importance of creating dummy variables, please recall what we talked about in class.
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