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 |