Table 3 The variance analysis of the fitting model.
From: Optimization pilot scale study on ammonia nitrogen removal by bio filter
Source | Sum of squares | DF | Mean square | F value | P value |
---|---|---|---|---|---|
Model | 3110.26 | 9 | 345.58 | 45.00 | < 0.0001 |
X1 | 141.90 | 1 | 141.90 | 18.48 | 0.0016 |
X2 | 945.73 | 1 | 945.73 | 123.15 | < 0.0001 |
X3 | 3.56 | 1 | 3.56 | 0.46 | 0.5113 |
X1·X2 | 6.72 | 1 | 6.72 | 0.87 | 0.3717 |
X1·X3 | 37.95 | 1 | 37.95 | 4.94 | 0.0404 |
X2·X3 | 18.69 | 1 | 18.69 | 2.43 | 0.1498 |
X12 | 1024.40 | 1 | 1024.40 | 133.40 | < 0.0001 |
X22 | 879.00 | 1 | 879.00 | 114.46 | < 0.0001 |
X32 | 415.75 | 1 | 415.75 | 54.14 | < 0.0001 |
Residual | 76.79 | 10 | 7.68 | ||
Lack of fit | 62.37 | 5 | 12.47 | 4.32 | 0.0670 |
Pure error | 14.43 | 5 | 2.89 | ||
Cor total | 3187.05 | 19 |