How to compare other two coefficients except the coefficient from the reference group in a regression model with dummy variable
In a regression model with dummy variables: For example, I would like to test the relationships between occupation types and salary. In this condition, occupation is a categorical variable with 4 types (i.e., occ1; occ2; occ3 and occ4); salary is a continuous variable. In the regression model to test the relationships between occupation types and salary, I regard occ4 as the reference group, val...