Table 5
Adjustment and variance analysis of models.
| Variable | Source | DF | Coefficient of determination | Sum of squares | F ratio |
|---|---|---|---|---|---|
| K232 | Model | 5 | R2 = 0.909 | 298.396 | 8.004 |
| Residues | 4 | Adj. R2 = 0.796 | 29.824 | Prob. > F | |
| Total model | 9 | 328.220 | 0.0329* | ||
| K270 | Model | 5 | R2 = 0.910 | 3.196 | 9.587 |
| Residues | 4 | Adj. R2 = 0.797 | 0.317 | Prob. > F | |
| Total model | 9 | 3.513 | 0.0324* | ||
| Acidity | Model | 5 | R2 = 0.909 | 0.091 | 7.9439 |
| Residues | 4 | Adj. R2 = 0.794 | 0.009 | Prob. > F | |
| Total model | 9 | 0.100 | 0.0333* | ||
| Peroxide value | Model | 5 | R2 = 0.925 | 3.859 | 9.897 |
| Residues | 4 | Adj. R2 = 0.832 | 0.312 | Prob. > F | |
| Total model | 9 | 4.171 | 0.0227* | ||
| Iodine value | Model | 5 | R2 = 0.980 | 3608.781 | 38.235 |
| Residues | 4 | Adj. R2 = 0.954 | 75.508 | Prob. > F | |
| Total model | 9 | 3684.289 | 0.0018* | ||
| Induction time | Model | 5 | R2 = 0.924 | 12.946 | 9.730 |
| Residues | 4 | Adj. R2 = 0.829 | 1.064 | Prob. > F | |
| Total model | 9 | 14.011 | 0.0234* |
K232 and K270: UV absorption coefficients at 232 and 270 nm; Acidity, expressed as equivalent oleic acid percentage; Peroxide value (PV), expressed as milliequivalents oxygen/kg oil; Iodine value (IV), expressed as mg KOH/g oil; Induction time (hour); DF: Degrees of freedom; * indicates a significant value.
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