Table 3 Fitting results using GM(1,1) model
Product code | Original value (mm) | Predicted value (mm) | Residual (mm) | Relative error (%) |
|---|---|---|---|---|
A4-1 | 5.918 | 5.918 | 0 | 0 |
A4-2 | 5.205 | 3.891 | 1.314 | 25.24 |
A4-3 | 4.393 | 4.355 | 0.037 | 0.85 |
A4-4 | 4.520 | 4.875 | − 0.354 | 7.84 |
A4-5 | 5.105 | 5.456 | − 0.351 | 6.87 |
A4-6 | 5.818 | 6.106 | − 0.289 | 4.96 |
A4-7 | 6.647 | 6.835 | − 0.188 | 2.83 |
A4-8 | 7.560 | 7.649 | − 0.089 | 1.18 |
A4-9 | 8.467 | 8.562 | − 0.094 | 1.11 |
A4-10 | 9.642 | 9.582 | 0.060 | 0.62 |
A4-11 | 10.811 | 10.725 | 0.086 | 0.79 |
A4-12 | 11.898 | 12.004 | − 0.106 | 0.89 |
A4-13 | 13.548 | 13.435 | 0.113 | 0.84 |