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Table 4 Model selection for essential oil and pectin extraction

From: Optimization of oil and pectin extraction from orange (Citrus sinensis) peels: a response surface approach

Essential oil Pectin
Model Linear 2FI Quadratic Cubic Linear 2FI Quadratic Cubic
Std. dev. 0.46 0.49 0.47 0.53 2.25 2.37 2.62 0.67
R2 0.70 0.70 0.79 0.80 0.84 0.85 0.86 0.99
Mean 2.09 2.09 2.09 2.09 19.75 19.75 19.75 19.75
Adjusted R2 0.64 0.60 0.63 0.53 0.80 0.78 0.73 0.98
C.V. 22.18 23.36 22.31 25.39 11.39 12.01 13.26 3.40
Predicted R2 0.29 0.01 − 0.50 − 21.70 0.70 0.38 − 0.13 0.79
PRESS 5.05 7.12 10.67 161.73 146.73 304.36 557.50 102.72
Adeq. Precision 9.73 8.00 6.84 5.50 16.80 12.81 9.80 28.08
Significant terms A, B A, B A, B A, B, C A, B, C A, B, C B, C2, AB, BC, A3, B3, C3