Nominal variable
1. genotype
2. blood type
3. zip code
4. gender
5. race
6. eye color
7. political party
8. ethnicity
9. hair color
10. nationality
11. sex
12. name
13. skin color
14. religion
15. marital status
Ordinal variable
1. education level
2. economic status
3. income level
4. satisfaction rating
5. age
6. course grades
7. likert scales
8. military rank
9. income level
10. ranking for honor students
11. teacher’s rank
12. transmutation table
13. email messages
14. educational background
15. worksheets number
Scale
1. degrees
2. fahrenheit
3. credit scores
4. weight
5. height
6. price
7. time
8. number of customers
9. number of competitors
10. length
11. area
12. population
13. Number of students who identify as religious
14. Years of work experience
15. Number of vehicles owned in the last 10 years