Appendix A: Variable Types
Categorical Variables
| Variable | Possible Values |
| Color Preference | Blue, Red, Yellow, Black, etc. |
| Make of automobile | Nissan, Ford, Volvo, etc. |
| Sales region | New England, Southwest, Central, etc. |
| Make/Brand | Nissan, GM, Ford, etc. |
| Industry | Hospitality, Construction, etc. |
Ordinal Variables
| Variable | Possible Values |
| Household income range | Less than $25k, $25k to $75k, etc. |
| Satisfaction | Very, Somewhat, etc. |
| Highest educational attainment | High School, College, Graduate degree, etc. |
Numeric Variables
| Variable | Possible Values |
| Number of children in household | 0, 1, 2, etc. |
| Number of years of professional experience | 0.0, 0.5, 1.0, … 16, etc. |
| Sick days used | 0, 1, 2, …. |
| $ Sales | Anything > $0 |
| Delivery time | 1 day, 2 days, etc. |
