Accuracy results for GM (1,1) and quadratic residual-correction GM (1,1)
| MSE | MAD | APE | MAPE | |||||
|---|---|---|---|---|---|---|---|---|
| Without COVID-19 | GM(1,1) | Residual-corrected GM(1,1) | GM(1,1) | Residual-corrected GM(1,1) | GM(1,1) | Residual-corrected GM(1,1) | GM(1,1) | Residual-corrected GM(1,1) |
| Production berth number | 50 | 38 | 5 | 4 | 493.65% | 395.40% | 3.63% | 2.91% |
| 10,000 tons berth number | 10 | 9 | 2 | 2 | 518.26% | 434.27% | 3.80% | 3.19% |
| Berth length | 1,265,657 | 1,171,324 | 727 | 632 | 482.00% | 409.96% | 3.54% | 3.01% |
| Cargo throughput | 1,582,688 | 1,332,596 | 919 | 757 | 501.03% | 390.74% | 3.68% | 2.87% |
| Container throughput | 1,260 | 914 | 21 | 17 | 760.42% | 328.00% | 5.59% | 2.41% |
| With COVID-19 | GM(1,1) | Residual-corrected GM(1,1) | GM(1,1) | Residual-corrected GM(1,1) | GM(1,1) | Residual-corrected GM(1,1) | GM(1,1) | Residual-corrected GM(1,1) |
| Production berth number | 56 | 38 | 4 | 3 | 224.40% | 153.51% | 3.30% | 2.26% |
| 10,000 tons berth number | 4 | 1 | 1 | 1 | 167.46% | 98.02% | 2.46% | 1.44% |
| Berth length | 6,12,497 | 4,29,938 | 526 | 336 | 176.64% | 122.15% | 2.60% | 1.80% |
| Cargo throughput | 1,465,365 | 7,35,915 | 687 | 430 | 175.53% | 120.11% | 2.58% | 1.77% |
| Container throughput | 1,762 | 1,364 | 25 | 17 | 235.76% | 163.44% | 3.47% | 2.40% |
| MSE | MAD | APE | MAPE | |||||
|---|---|---|---|---|---|---|---|---|
| Without COVID-19 | GM(1,1) | Residual-corrected GM(1,1) | GM(1,1) | Residual-corrected GM(1,1) | GM(1,1) | Residual-corrected GM(1,1) | GM(1,1) | Residual-corrected GM(1,1) |
| Production berth number | 50 | 38 | 5 | 4 | 493.65% | 395.40% | 3.63% | 2.91% |
| 10,000 tons berth number | 10 | 9 | 2 | 2 | 518.26% | 434.27% | 3.80% | 3.19% |
| Berth length | 1,265,657 | 1,171,324 | 727 | 632 | 482.00% | 409.96% | 3.54% | 3.01% |
| Cargo throughput | 1,582,688 | 1,332,596 | 919 | 757 | 501.03% | 390.74% | 3.68% | 2.87% |
| Container throughput | 1,260 | 914 | 21 | 17 | 760.42% | 328.00% | 5.59% | 2.41% |
| With COVID-19 | GM(1,1) | Residual-corrected GM(1,1) | GM(1,1) | Residual-corrected GM(1,1) | GM(1,1) | Residual-corrected GM(1,1) | GM(1,1) | Residual-corrected GM(1,1) |
| Production berth number | 56 | 38 | 4 | 3 | 224.40% | 153.51% | 3.30% | 2.26% |
| 10,000 tons berth number | 4 | 1 | 1 | 1 | 167.46% | 98.02% | 2.46% | 1.44% |
| Berth length | 6,12,497 | 4,29,938 | 526 | 336 | 176.64% | 122.15% | 2.60% | 1.80% |
| Cargo throughput | 1,465,365 | 7,35,915 | 687 | 430 | 175.53% | 120.11% | 2.58% | 1.77% |
| Container throughput | 1,762 | 1,364 | 25 | 17 | 235.76% | 163.44% | 3.47% | 2.40% |
Source(s): Authors’ own work