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Table 6 Analysis of variance for MRR (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 2520.93 20 126.05 71.03 <0.0001 Significant
A 2134.51 1 2134.51 1202.89 <0.0001  
B 250.15 1 250.15 140.97 <0.0001  
C 3.75 1 3.75 2.11 0.1584  
D 5.62 1 5.62 3.17 0.0873  
E 1.05 1 1.05 0.59 0.4493  
A2 4.26 × 10-03 1 4.26 × 10-03 2.40 × 10-03 0.9613  
B2 7.58 1 7.58 4.27 0.0493  
C2 4.99 1 4.99 2.81 0.1059  
D2 19.52 1 19.52 11 0.0028  
E2 12.23 1 12.23 6.89 0.0146  
AB 59.27 1 59.27 33.4 <0.0001  
AC 0.17 1 0.17 0.095 0.7605  
AD 0.62 1 0.62 0.35 0.5602  
AE 0.89 1 0.89 0.5 0.486  
BC 4.51 1 4.51 2.54 0.1233  
BD 0.7 1 0.7 0.39 0.5362  
BE 3.33 1 3.33 1.88 0.1829  
CD 0.81 1 0.81 0.46 0.5045  
CE 0.81 1 0.81 0.46 0.5045  
DE 0.19 1 0.19 0.1 0.749  
Residual 44.36 25 1.77    
Lack of Fit 40.85 20 2.04 2.91 0.1199 Not significant
Pure Error 3.51 5 0.7    
Cor Total 2565.29 45     
Std. Dev. = 1.33   R-Squared = 0.9827
Mean = 16.24   Pred R-Squared = 0.9343
C.V. = 8.2   Adeq Precision = 35.184
PRESS = 168.46   Adj R-Squared = 0.9689