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Table 4 ANOVA for response surface quadratic model

From: Enhanced methane production of vinegar residue by response surface methodology (RSM)

Source Sum of squares Degree of freedom Mean squares F-value p-value prob >F  
Model 18185.28 9 2020.59 24.04 <0.0001 Significant
X1-F/I 3223.97 1 3223.97 38.35 0.0001  
X2-loading 4762.71 1 4762.71 56.66 <0.0001  
X3-pH 1803.34 1 1803.34 21.45 0.0009  
X1X2 722.00 1 722.00 8.59 0.0150  
X1X3 0.15 1 0.15 0.00 0.9676  
X2X3 10.35 1 10.35 0.12 0.7329  
X 21 161.29 1 161.29 1.92 0.1961  
X 22 1664.55 1 1664.55 19.80 0.0012  
X 23 5999.04 1 5999.04 71.36 <0.0001  
Residual 840.62 10 84.06    
Lack of fit 590.02 5 118.00 2.35 0.1845 Not significant
Pure error 250.60 5 50.12    
Cor total 19025.90 19     
Standard deviation Mean C.V. % R-squared Adjusted R-squared Predicted R-squared Adeq precision
9.1700 149.6100 6.1300 0.9558 0.9161 0.7455 18.0260
  1. C.V. % coefficient of variation