Table 4.
Final proportional hazards regression results for performance-related attrition.
| Model Fit |
Step 3 Predictor Statistics |
|||||||
|---|---|---|---|---|---|---|---|---|
| Model | df | −2LL | Δ-2LL | Predictor | β | HR | HR 95% LL | HR 95% UL |
| Step 1 | 1 | 152,778.28 | — | AFQT | −0.192 | 0.825 | 0.804 | 0.847 |
| Step 2 | 8 | 152,240.07 | 538.21 | Achievement | −0.044 | 0.957 | 0.924 | 0.992 |
| Step 3 | 9 | 152,232.98 | 7.09 | Adjustment | 0.031 | 1.032 | 1.005 | 1.059 |
| Attention Seeking | −0.080 | 0.924 | 0.901 | 0.947 | ||||
| Intellectual Efficiency | 0.068 | 1.070 | 1.041 | 1.100 | ||||
| Optimism | −0.054 | 0.947 | 0.923 | 0.972 | ||||
| Physical Conditioning | −0.236 | 0.790 | 0.770 | 0.810 | ||||
| Selflessness | 0.051 | 1.052 | 1.026 | 1.079 | ||||
| Time x Achievement | −0.005 | 0.995 | 0.992 | 0.999 | ||||
n = 104,024. −2LL = − 2 log likelihood. β = standardized parameter. HR = Hazard ratio. 95% LL = 95% confidence interval lower limit of the hazard ratio. 95% UL = 95% confidence interval upper limit of the hazard ratio. The Step 1 model includes the AFQT only. The Step 2 model adds the TAPAS scale main effects to the Step 1 model. The Step 3 model adds the interaction terms (i.e., time-varying effects) to the Step 2 model. All models are significant, p < .05. The Step 2 and Step 3 models resulted in significant changes in model fit compared to the previous steps based on a Likelihood Ratio χ2 test, p< .05. Bolded values indicate significant predictor effects, p < .05.