Research Article
Improving Precision and Reducing Runtime of Microscopic Traffic Simulators through Stratified Sampling
Table 2
Coefficient of variation of estimators of network performance under SRS, LHS1 and LHS2, and AV1 and AV2.
| |
Network | |
Coefficient of variation of estimator
for network average delay |
Relative reduction in coefficient of variation of estimator for network
average delay | | SRS | LHS1 | LHS2 | AV1 | AV2 | LHS1 versus AV1 | LHS2 versus AV2 | LHS2 versus LHS1 | AV2 versus AV1 | LHS1 versus SRS | LHS2 versus SRS |
| | Arterial undersaturated | 2 | 5.0% | 4.2% | 4.0% | 4.3% | 4.0% | 1% | 1% | 6% | 6% | 16% | 21% | | 4 | 3.5% | 2.6% | 2.6% | 2.8% | 2.7% | 8% | 6% | 0% | 2% | 27% | 27% | | 10 | 2.2% | 1.5% | 1.4% | 1.9% | 1.7% | 18% | 18% | 11% | 12% | 31% | 39% | | 20 | 1.6% | 1.0% | 0.9% | 1.3% | 1.2% | 24% | 20% | 5% | 10% | 38% | 41% | | 50 | 1.0% | 0.6% | 0.6% | 0.8% | 0.8% | 22% | 27% | 11% | 5% | 37% | 44% | | 100 | 0.7% | 0.4% | 0.4% | 0.6% | 0.5% | 30% | 26% | 7% | 12% | 39% | 44% |
| | Arterial oversaturated | 2 | 6.9% | 5.0% | 4.8% | 4.7% | 3.4% | −8% | −41% | 4% | 27% | 26% | 29% | | 4 | 4.8% | 2.7% | 2.1% | 3.3% | 2.4% | 16% | 11% | 22% | 27% | 43% | 56% | | 10 | 3.1% | 1.4% | 1.1% | 2.1% | 1.5% | 36% | 28% | 20% | 29% | 56% | 65% | | 20 | 2.2% | 0.8% | 0.7% | 1.5% | 1.0% | 43% | 30% | 16% | 31% | 62% | 68% | | 50 | 1.4% | 0.5% | 0.4% | 0.9% | 0.7% | 46% | 37% | 15% | 28% | 65% | 70% | | 100 | 1.0% | 0.3% | 0.3% | 0.6% | 0.5% | 51% | 42% | 11% | 24% | 68% | 71% |
| | Grid undersaturated | 2 | 2.2% | 2.0% | 1.9% | 2.1% | 2.0% | 6% | 5% | 5% | 5% | 9% | 13% | | 4 | 1.6% | 1.3% | 1.3% | 1.3% | 1.4% | −1% | 4% | 1% | −4% | 14% | 15% | | 10 | 1.0% | 0.8% | 0.8% | 0.9% | 0.8% | 12% | 8% | 0% | 4% | 21% | 21% | | 20 | 0.7% | 0.6% | 0.5% | 0.6% | 0.6% | 3% | 9% | 7% | 0% | 16% | 22% | | 50 | 0.4% | 0.3% | 0.3% | 0.4% | 0.4% | 9% | 9% | 1% | 1% | 23% | 24% | | 100 | 0.3% | 0.3% | 0.2% | 0.3% | 0.3% | 4% | 13% | 9% | −1% | 20% | 27% |
| | Grid oversaturated | 2 | 9.6% | 8.2% | 7.3% | 7.9% | 6.2% | −5% | −17% | 11% | 20% | 14% | 24% | | 4 | 6.8% | 5.0% | 4.3% | 5.2% | 4.5% | 4% | 6% | 15% | 14% | 26% | 37% | | 10 | 4.3% | 2.6% | 2.1% | 3.5% | 2.9% | 26% | 26% | 17% | 18% | 40% | 50% | | 20 | 3.0% | 1.7% | 1.4% | 2.4% | 1.9% | 30% | 26% | 15% | 20% | 44% | 53% | | 50 | 1.9% | 1.0% | 0.9% | 1.6% | 1.3% | 36% | 29% | 12% | 20% | 48% | 54% | | 100 | 1.4% | 0.7% | 0.6% | 1.1% | 0.9% | 39% | 31% | 7% | 17% | 51% | 55% |
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