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Table 8 Analysis of variance for TWR (before elimination)

From: Parametric optimization of powder mixed electrical discharge machining for nickel-based superalloy inconel-800 using response surface methodology

Source Sum of squares DF Mean squares F - value Prob > F  
Model 17.61 20 0.88 146.3 <0.0001 Significant
A 0.19 1 0.19 31.04 <0.0001  
B 8.60 × 10-03 1 8.60 × 10-03 1.43 0.2431  
C 7.97 × 10-03 1 7.97 × 10-03 1.32 0.2609  
D 9.98 1 9.98 1658.23 <0.0001  
E 0.033 1 0.033 5.44 0.028  
A2 1.30 × 10-03 1 1.30 × 10-03 0.22 0.646  
B2 4.03 × 10-04 1 4.03 × 10-04 0.067 0.798  
C2 1.82 × 10-03 1 1.82 × 10-03 0.3 0.5868  
D2 6.06 1 6.06 1007.42 <0.0001  
E2 5.41 × 10-04 1 5.41 × 10-04 0.09 0.7668  
AB 2.30 × 10-03 1 2.30 × 10-03 0.38 0.5417  
AC 0.013 1 0.013 2.1 0.1595  
AD 0.01 1 0.01 1.66 0.2092  
AE 4.36 × 10-03 1 4.36 × 10-03 0.72 0.403  
BC 4.16 × 10-03 1 4.16 × 10-03 0.69 0.4136  
BD 0.04 1 0.04 6.58 0.0167  
BE 1.23 × 10-03 1 1.23 × 10-03 0.2 0.6558  
CD 0.013 1 0.013 2.12 0.1577  
CE 8.12 × 10-04 1 8.12 × 10-04 0.13 0.7164  
DE 6.97 × 10-03 1 6.97 × 10-03 1.16 0.2921  
Residual 0.15 25 6.02 × 10-03    
Lack of Fit 0.14 20 7.11 × 10-03 4.26 0.0574 Not significant
Pure Error 8.34 × 10-03 5 1.67 × 10-03    
Cor. Total 17.76 45     
Std. Dev. = 0.078   R-Squared = 0.9915
Mean = 0.38   Adj R-Squared = 0.9848
C.V. = 20.6   Pred R-Squared = 0.9673
PRESS = 0.58   Adeq Precision = 36.969