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.




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