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Table 5 Sequential model sum of squares and ANOVA for response surface linear model for pectin extraction

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

Source Sum of squares Df Mean square F value Prob > F  
Mean 7800.46 1 7800.46  
Linear 410.57 3 136.86 27.05 < 0.0001 Suggested
2FI 7.87 3 2.62 0.47 0.7107  
Quadratic 4.50 3 1.50 0.22 0.8812  
Cubic 65.90 4 16.47 36.63 0.0002 Aliased
Residual 2.70 6 0.45  
Total 8292.00 20 414.60  
Model 410.57 3 136.86 27.05 < 0.0001  
A 68.97 1 68.97 13.65 0.0020  
B 243.98 1 243.98 48.21 < 0.0001  
C 97.61 1 97.61 19.29 0.0005  
Residual 80.97 16 5.06  
Lack of fit 78.75 11 7.16 16.17 < 0.0033  
Pure error 2.21 5 0.44  
Correlation total 491.54 19  
  1. Values > 0.05 are not significant
  2. A represents extraction temperature, B represents extraction time, C represents extraction pH, df degree of freedom