Table 3 Simulation results.
From: Purposeful selection of variables in logistic regression
β 2 | n | Purposeful | Stepwise | Backward | Forward |
|---|---|---|---|---|---|
0.13 | 60 | 9.7 | 6.3 | 10.3 | 10.8 |
| Â | 120 | 25.8 | 19.8 | 24.9 | 23 |
| Â | 240 | 55.5 | 52 | 54.9 | 37.4 |
| Â | 360 | 66.4 | 65.5 | 65.8 | 38.7 |
| Â | 480 | 72.5 | 72.7 | 72.8 | 41.1 |
| Â | 600 | 71.4 | 72.9 | 72.9 | 42.9 |
0.07 | 60 | 7.5 | 3.1 | 4.4 | 6.7 |
| Â | 120 | 18.6 | 11.3 | 12.2 | 15.8 |
| Â | 240 | 32.2 | 22.5 | 22.9 | 21.4 |
| Â | 360 | 41.5 | 35.5 | 35.5 | 26.9 |
| Â | 480 | 47.9 | 44.5 | 44.5 | 34.6 |
| Â | 600 | 52 | 50.5 | 50.5 | 35.5 |