Thus, in this example, if an employee has a B.A. or a B.S., . If the employee has a Masters then, . It is then implied that if an employee has a PhD then,. The no-interaction model only considers. However, the interaction model below represents the mean change in annual salary related to a one unit increase in the number of years of experience to depend on what type of college degree the employee has.
. If the 
. It is then implied that 
. The no-interaction 
. However, the interaction model below represents the mean change in annual salary related to a one unit increase in the number of years of experience to depend on what type of college degree the employee has.