Table 3.
ANOVA results for the quadratic equation for the extraction yield of essential oil.
| Term | Freedom degrees | Sum of squares | Mean square | F value | P r > F |
|---|---|---|---|---|---|
| Model | 14 | 0.564475 | 0.04032 | 35.08174 | <0.0001 |
| X 1 | 1 | 0.002408 | 0.002408 | 2.095468 | 0.173353 |
| X 2 | 1 | 0.000533 | 0.000533 | 0.464048 | 0.508671 |
| X 3 | 1 | 0.009633 | 0.009633 | 8.381873 | 0.013447 |
| X 4 | 1 | 0.015408 | 0.015408 | 13.40665 | 0.003257 |
| X 1 · X1 | 1 | 0.016875 | 0.016875 | 14.68278 | 0.002388 |
| X 1 · X2 | 1 | 0.007225 | 0.007225 | 6.286405 | 0.027545 |
| X 1 · X3 | 1 | 0.003025 | 0.003025 | 2.632024 | 0.130689 |
| X 1 · X4 | 1 | 0.003025 | 0.003025 | 2.632024 | 0.130689 |
| X 2 · X2 | 1 | 0.0147 | 0.0147 | 12.79033 | 0.003808 |
| X 2 · X3 | 1 | 0.000625 | 0.000625 | 0.543807 | 0.475032 |
| X 2 · X4 | 1 | 0.0081 | 0.0081 | 7.047734 | 0.020994 |
| X 3 · X3 | 1 | 0.472033 | 0.472033 | 410.7118 | <0.0001 |
| X 3 · X4 | 1 | 0.0081 | 0.0081 | 7.047734 | 0.020994 |
| X 4 · X4 | 1 | 0.644342 | 0.644342 | 76.92326 | <0.0001 |
| Pure error | 12 | 0.013792 | 0.001149 | No clear | No clear |
| R 2 = 0.9761; Adj. R2 = 0.9483; CV = 3.25%; Adeq. precision = 18.571 | |||||