I need to run multiple regression with 2 IVs and 1 DV and include a control variables. The control variable is "Type of House" and has 4 categories: 1=bungalow, 2=apartment, 3=penthouse and 4=condominium.
How do I enter the control variables into the model? Is it just the way it is (i.e., nominal) or do I have to create dummy variables? If I need to create dummy variables, do I have to enter only 3 categories (i.e. k-1)? Lastly, how do I present the table and interpret?