| Nomenclature |
|
| Pn | Probability of death for pedestrian n |
| Xn | Independent variable for pedestrian n |
| β | Corresponding efficient for variable Xn |
| K | Number of independent variables |
| M | Number of variables and interaction effects |
| HL | Hosmer-Lemeshow statistic |
| O | Observed accidents of a fatal outcome |
| E | Expected accidents of a fatal outcome |
| N | Number of observations |
| θi | Predicted risk for the ith risk decile group |