Research Article
Container Throughput Forecasting of Tianjin-Hebei Port Group Based on Grey Combination Model
Table 5
Comparison of BP neural network and the original data.
| Year | Tian. original norm. | Tang. original norm. | Qin. original norm. | Huang. original norm. | Total original data norm. | Original data (unit: 10,000 TEU) | Total after BPNN training | Total data antinorm. (unit: 10,000 TEU) | Error |
| 2012 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 1320 | 0.018 | 1320.00 | 0.00% | 2013 | 0.10 | 0.10 | 0.15 | 0.19 | 0.11 | 1436 | 0.124 | 1446.95 | 0.76% | 2014 | 0.24 | 0.22 | 0.20 | 0.31 | 0.24 | 1589 | 0.232 | 1576.69 | −0.77% | 2015 | 0.24 | 0.36 | 0.45 | 0.58 | 0.30 | 1663 | 0.331 | 1696.50 | 2.01% | 2016 | 0.30 | 0.49 | 0.51 | 0.72 | 0.38 | 1758 | 0.396 | 1773.62 | 0.89% | 2017 | 0.37 | 0.68 | 0.62 | 0.79 | 0.48 | 1881 | 0.442 | 1829.75 | −2.72% | 2018 | 0.49 | 0.82 | 0.67 | 0.89 | 0.60 | 2027 | 0.597 | 2016.10 | −0.54% | 2019 | 0.65 | 0.82 | 0.78 | 0.67 | 0.70 | 2143 | 0.659 | 2089.84 | −2.48% | 2020 | 0.79 | 0.88 | 0.78 | 0.90 | 0.82 | 2282 | 0.801 | 2261.02 | −0.92% |
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