Table 6 ANOVA of the regression models.
From: Uniaxial compressive strength of cemented coal gangue backfill based on response surface methodology
Source | Sum of squares | Mean square | Degree of freedom | F value | P value (Prob > F) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Y1 | Y2 | Y1 | Y2 | Y1 | Y2 | Y1 | Y2 | Y1 | Y2 | ||||||
Model | 4.73 | 0.11 | 0.53 | 0.012 | 9 | 9 | 36.07 | 46.82 | 0.0005a | 0.0003a | |||||
X1 | 3.41 | 0.019 | 3.41 | 0.019 | 1 | 1 | 233.92 | 74.45 | < 0.0001a | 0.0003a | |||||
X2 | 1.14 | 0.016 | 1.14 | 0.016 | 1 | 1 | 78.26 | 63.41 | 0.0003a | 0.0005a | |||||
X3 | 1.445 × 10− 4 | 8.450 × 10− 5 | 1.445 × 10− 4 | 8.450 × 10− 5 | 1 | 1 | 9.912 × 10− 3 | 0.33 | 0.9246 | 0.5891 | |||||
X1 X2 | 0.017 | 5.290 × 10− 4 | 0.017 | 5.290 × 10− 4 | 1 | 1 | 1.15 | 2.08 | 0.3325 | 0.2086 | |||||
X1 X 3 | 0.013 | 1.102 × 10− 4 | 0.013 | 1.102 × 10− 4 | 1 | 1 | 0.92 | 0.43 | 0.3808 | 0.5392 | |||||
X2 X 3 | 1.521 × 10− 3 | 6.250 × 10− 6 | 1.521 × 10− 3 | 6.250 × 10− 6 | 1 | 1 | 0.10 | 0.025 | 0.7598 | 0.8815 | |||||
X12 | 0.016 | 1.368 × 10− 3 | 0.016 | 1.368 × 10− 3 | 1 | 1 | 1.07 | 5.39 | 0.3481 | 0.0680 | |||||
X22 | 0.016 | 2.308 × 10− 7 | 0.016 | 2.308 × 10− 7 | 1 | 1 | 1.10 | 9.084 × 10− 4 | 0.3419 | 0.9771 | |||||
X32 | 0.11 | 0.068 | 0.11 | 0.068 | 1 | 1 | 7.83 | 266.84 | 0.0381b | < 0.0001a | |||||
Residual | 0.073 | 1.270 × 10− 3 | 0.015 | 2.540 × 10− 4 | 5 | 5 | |||||||||
Lack of Fit | 0.040 | 1.144 × 10− 3 | 0.013 | 3.814 × 10− 4 | 3 | 3 | 0.83 | 6.05 | 0.5886 | 0.1450 | |||||
Pure Error | 0.033 | 1.260 × 10− 4 | 0.016 | 6.300 × 10− 5 | 2 | 2 | |||||||||
Cor Total | 4.81 | 0.11 | 14 | 14 | |||||||||||
