Table 2.
Analysis of variance for response surface quadratic model of Croton macrostachyus seed oil yield.
| Sources | Sum of squares | Degree of freedom | Mean of squares | F-value | P-value | |
|---|---|---|---|---|---|---|
| Model | 361.30 | 14 | 25.81 | 423.40 | 0.0001 | significant |
| A-Temperature | 20.51 | 1 | 20.51 | 336.50 | 0.0001 | |
| B-Solute: solvent ratio | 0.2139 | 1 | 0.2139 | 3.51 | 0.0820 | |
| C-Extraction time | 71.46 | 1 | 71.46 | 1172.46 | 0.0001 | |
| D-Particle size | 150.50 | 1 | 150.50 | 2469.21 | 0.0001 | |
| AB | 0.1581 | 1 | 0.1581 | 2.59 | 0.1296 | |
| AC | 1.61 | 1 | 1.61 | 26.46 | 0.0001 | |
| AD | 5.81 | 1 | 5.81 | 95.29 | 0.0001 | |
| BC | 16.76 | 1 | 16.76 | 275.05 | 0.0001 | |
| BD | 0.9502 | 1 | 0.9502 | 15.59 | 0.0015 | |
| CD | 4.67 | 1 | 4.67 | 76.55 | 0.0001 | |
| A2 | 84.62 | 1 | 84.62 | 1388.27 | 0.0001 | |
| B2 | 3.13 | 1 | 3.13 | 51.39 | 0.0001 | |
| C2 | 12.27 | 1 | 12.27 | 201.39 | 0.0001 | |
| D2 | 14.84 | 1 | 14.84 | 243.42 | 0.0001 | |
| Residual | 0.8533 | 14 | 0.0610 | |||
| Lack of Fit | 0.7440 | 9 | 0.0827 | 3.78 | 0.0786 | Not significant |