| Quantitative variables | ||
| Name | Description | |
| BREAKDOWN | Probability to have a breakdown in the next year. This is the reliability factor. | |
| POWER | Power in PS. | |
| LENGTH | Length in centimetres. | |
| DOORS | Number of doors. | |
| PLACES | Passenger places. | |
| LOAD | Car load in kilogrammes. | |
| WEIGHT | Weight in kilogrammes. | |
| FUEL | Fuel consumption in litres per hundred kilometres. | |
| CO2 | Carbon dioxide emissions in grammes per kilometre. | |
| TORQUE | Engine torque in Newton-meter. | |
| Qualitative variables | ||
| Name | Description | Dummy variables |
| ENERGY | Energy efficiency label | A, B, C, D, E, F and (G) |
| SAFETY | Safety label | 5-STARS, 4-STARS and (3-STARS) |
| ENGINE | Engine position | FRONT-ENGINE and (REAR-ENGINE) |
| DRIVE | Drive wheels | FRONT-WHEEL, REAR-WHEEL and (FOUR-WHEEL) |
| CLASS | Class according to TCS | SUPERIOR, MEDIUM, LOWER-MEDIUM, |
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| CROSS-COUNTRY, MINIVAN, SMALL and (MICRO) |
| BRAND | Brand | AUDI, BMW, CHEVROLET,... |