Table 3.
Regression coefficients of the predicted quadratic polynomial model for response variables of the OOC% of HYOOA.
| Variables | Coefficients (β), OOC% (Y) | T | P | Notability |
|---|---|---|---|---|
| Intercept | 1.63 | 5.19 | 0.0064 | *** |
| Linear | ||||
| X1 | −0.31 | 1.76 | 0.2143 | |
| X2 | −0.55 | 5.73 | 0.0378 | ** |
| X3 | −0.11 | 0.23 | 0.6395 | |
| X4 | −0.064 | 7.548 E − 003 | 0.9325 | |
| Quadratic | ||||
| X11 | 0.16 | 0.19 | 0.6699 | |
| X22 | 1.18 | 8.1 | 0.0172 | ** |
| X33 | −0.078 | 0.65 | 0.4377 | |
| X44 | −1.01 | 1.47 | 0.2537 | |
| Interaction | ||||
| X12 | 0.13 | 0.51 | 0.4912 | |
| X13 | 0.14 | 2.05 | 0.1830 | |
| X14 | −0.22 | 0.40 | 0.5423 | |
| X23 | −0.23 | 5.99 | 0.0344 | |
| X24 | 1.02 | 8.22 | 0.0168 | |
| X34 | −0.017 | 8.374 E − 003 | 0.9289 | |
| R2 | 0.87 |
Notes: X1 = OA/MEOA ratio; X2 = PTSA/MEOA ratio; X3 = reaction temperature; X4 = reaction time, **P < 0.05; ***P < 0.01. T : F-test value. See Table 2 for a description of the abbreviations.