Research Article
Research on the Concentration Prediction of Nitrogen in Red Tide Based on an Optimal Grey Verhulst Model
Table 3
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 (%) |
| | 30 | 30 | 0 | 29.9 | −0.5 | 27.9 | −6.9 | | 33 | 36.5 | 10.6 | 35.9 | 9.1 | 33.8 | 2.5 | | 37 | 43.2 | 16.9 | 42.7 | 15.5 | 40.4 | 9.2 | | 45 | 50.5 | 12.1 | 49.9 | 10.9 | 47.5 | 5.4 | | 55 | 57.8 | 5.1 | 57.2 | 4.1 | 54.7 | −0.4 | | 65 | 65.1 | 0.2 | 64.6 | −0.7 | 62.1 | −4.4 | | 72 | 72.1 | 0.09 | 71.5 | −0.6 | 69.2 | −3.9 | | 76 | 78.4 | 3.3 | 78.0 | 2.6 | 75.9 | −0.1 |
| | Average relative error (%) | 6.9 | 5.5 | 4.1 |
| | Extrapolation values | 84.2 | 83.6 | 81.9 |
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