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Table 3 Sequential model sum of squares and ANOVA for response surface linear model for essential oil 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 56.74 1 56.74  
Linear 4.98 2 2.49 11.59 0.0025 Suggested
2FI 2.500E−003 1 2.500E−003 0.01 0.9207  
Quadratic 0.62 2 0.31 1.43 0.3006  
Cubic 0.11 2 0.06 0.20 0.8229 Aliased
Residual 1.41 5 0.28  
Total 63.87 13 4.91  
Model 4.98 2 2.49 11.59 0.0025  
A 1.46 1 1.46 6.78 0.0263  
B 3.52 1 3.52 16.40 0.0023  
Residual 2.15 10 0.21  
Lack of fit 2.13 6 0.36 91.80 0.0003  
Pure error 0.015 4 3.870E−003  
Correlation total 7.12 12  
  1. Values > 0.05 are not significant
  2. A represents extraction temperature, B represents extraction time, df degree of freedom