Marital status
0 = Unmarried
1 = Married

Level of education
1 = Did not complete high school
2 = High school degree
3 = Some college
4 = College degree
5 = Post-undergraduate degree

Retired
0 = No
1 = Yes

0 = Male
1 = Female

Customer category
1 = Basic service
2 = E-service
3 = Plus service
4 = Total service