Table 9.
Relationship between actual and predicted values for ASTM 667-98 and ASTM 668-98.
| Name |
ASTM 667-98 |
ASTM 668-98 |
||||
|---|---|---|---|---|---|---|
| Settings (°C) | Actual Value (°C) | Predicted Value (°C) | Error | Actual Value (°C) | Predicted Value (°C) | Error |
| 1st Zone | 125 | 123.0092 | 1.9908 | 132 | 130.9756 | 1.0244 |
| 2nd Zone | 150 | 150.0148 | -0.0148 | 154 | 156.9521 | -2.9521 |
| 3rd Zone | 163 | 160.9945 | 2.0055 | 160 | 159.9292 | 0.0708 |
| 4th Zone | 164 | 164.0042 | -0.0042 | 160 | 159.9243 | 0.0757 |
| 5th Zone | 165 | 164.9903 | 0.0097 | 160 | 159.9500 | 0.05 |
| 6th Zone | 160 | 163.0020 | -3.002 | 160 | 159.9783 | 0.0217 |
| 7th Zone | 160 | 162.0140 | -2.014 | 160 | 159.9548 | 0.0452 |
| Clamp | 175 | 174.9839 | 0.0161 | 175 | 175.9558 | -0.9558 |
| Neck | 150 | 147.0494 | 2.9506 | 150 | 148.1633 | 1.8367 |
| Crosshead | 170 | 169.9934 | 0.0066 | 170 | 169.9781 | 0.0219 |
| Die | 175 | 175.0047 | -0.0047 | 175 | 174.9769 | 0.0231 |
The mean square error (MSE) for the PVC grades to determine the accuracy of the proposed model is as shown in Table 10.