Research Article
Research on the Concentration Prediction of Nitrogen in Red Tide Based on an Optimal Grey Verhulst Model
Table 6
Accuracy comparison of GVM, TPGVM, and TRGVM models.
| Measured raw data | GVM | TPGVM | TRGVM | Prediction value | The relative error (%) | Prediction value | The relative error (%) | Prediction value | The relative error (%) |
| 28 | 28 | 0 | 27.3 | −2.5 | 26.1 | −6.8 | 30 | 33.4 | 11.3 | 33.5 | 11.6 | 33.8 | 12.7 | 32 | 39.2 | 22.5 | 38.2 | 19 | 34.8 | 8.8 | 35 | 41.3 | 18 | 41.3 | 18 | 40.7 | 16 | 36 | 43.5 | 17.5 | 42.2 | 14.1 | 39.2 | 6.0 | 42 | 44.5 | 5.9 | 43.9 | 4.5 | 42.2 | 0.5 | 46 | 48.8 | 6.1 | 45.3 | −1.5 | 44.9 | −2.4 | 51 | 53.6 | 5.1 | 52.8 | 3.5 | 53.2 | 4.3 | 57 | 60.3 | 5.8 | 60.2 | 5.6 | 58.9 | 3.3 | 65 | 67.6 | 4 | 68.1 | 4.7 | 66.7 | 2.6 | 74 | 77.8 | 5.1 | 72.6 | −1.9 | 75.6 | 2.2 | 83 | 85.9 | 3.5 | 85.3 | 2.8 | 83.5 | 0.6 | 90 | 93.6 | 4 | 92.5 | 2.8 | 92.1 | 2.3 | 95 | 98.5 | 3.7 | 97.2 | 2.3 | 96.3 | 1.3 | 99 | 100.7 | 1.7 | 101.1 | 2.1 | 100.5 | 1.5 | 102 | 103.2 | 1.1 | 102.7 | 0.7 | 101.4 | 0.6 |
| Average relative error (%) | 7.2 | 5.3 | 3.3 |
| Extrapolation values | 104.2 | 102.2 | 101.5 | 104.7 | 103.8 | 102.1 |
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