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HEI–population density correlation and improvement by Method.
| Method | 1 | 2* | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
|---|---|---|---|---|---|---|---|---|---|
| Correlation | 0.53 | 0.64 | 0.15 | 0.12 | 0.72 | 0.70 | 0.22 | 0.77 | 0.45 |
| Improvement rate | − 17% | 0% | − 77% | − 81% | 13% | 9% | − 66% | 20% | − 30% |
*Improvement Rate is calculated relative to Method 2.
