Table 6.
Analysis of variance results representing linear, quadratic and interaction terms of each variable and coefficient for the prediction model (solvent = water)
| Source | df | Total phenol | Yield | ||
|---|---|---|---|---|---|
| Coef | P value | Coef | P value | ||
| Model | 5 | 12.79 | 0.000 | 4.22 | 0.000 |
| X1 | 1 | 1.184 | 0.006 | 0.415 | 0.014 |
| X2 | 1 | 0.222 | 0.041 | 0.264 | 0.000 |
| X1 2 | 1 | −0.0659 | 0.089 | −0.03 | 0.069 |
| X2 2 | 1 | −0.0061 | 0.037 | −0.008 | 0.000 |
| X1X2 | 1 | −0.001 | 0.896 | 0.008 | 0.039 |
| Lack of fitness | 5 | 0.598 | 0.014 | ||
| R2 | 0.969 | 0.98 | |||
| Adj-R2 | 0.947 | 0.94 | |||
| CV | 0.2215 | 0. 014 |
Xi, linear; Xi2, quadratic and XiXj: interaction of variables (1: time, 2: liquid/solid ratio)