Kuiper (2008) collected data on Kelly Blue Book resale data for 804 GM cars (2005 model year).
data frame of the suggested retail price (column Price) and various
characteristics of each car (columns Mileage, Cylinder, Doors, Cruise,
Sound, Leather, Buick, Cadillac, Chevy, Pontiac, Saab,
Saturn, convertible, coupe, hatchback, sedan and wagon)