Table 4.
Impact of varying the parameters of the evolutionary algorithm in the liver case. The pertinent changes in parameter values are shown in bold type. Note that the median and range final objective values for run 6 relate to the median value attained by the population at each of multiple runs rather than the value attained by the individuals at a single run.
| Parameter | Run 1 | Run 2 | Run 3 | Run 4 | Run 5 | Run 6 |
|---|---|---|---|---|---|---|
| Population size (plans) | 20 | 20 | 20 | 20 | 20 | 20 |
| Generations | 20 | 20 | 20 | 20 | 20 | 20 |
| Statistical repeats | 1 | 1 | 1 | 1 | 1 | 25 |
| Crossover ratio | 0.4 | 0.3 | 0.5 | 0.4 | 0.4 | 0.4 |
| Mutation probability | 0.05 | 0.05 | 0.05 | 0.01 | 0.1 | 0.05 |
| Final objective median | 16.8 | 17.7 | 19.3 | 15.1 | 18.9 | 16.7 |
| Final objective range | 12.9–28.3 | 14.6–28.2 | 14.0–25.8 | 13.1–18.0 | 14.7–27.1 | 13.3–18.8 |
| Lowest objective found | 12.9 | 14.0 | 14.0 | 13.0 | 11.9 | 11.0 |