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Table 7 Analysis of variance for MRR (after backward 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 Square F - Value Prob > F  
Model 2494.05 7 356.29 190.05 <0.0001 Significant
A 2134.51 1 2134.51 1138.55 <0.0001  
B 250.15 1 250.15 133.43 <0.0001  
D 5.62 1 5.62 3 0.0915  
E 1.05 1 1.05 0.56 0.4591  
D2 14.54 1 14.54 7.75 0.0083  
E2 22.51 1 22.51 12.01 0.0013  
AB 59.27 1 59.27 31.61 <0.0001  
Residual 71.24 38 1.87    
Lack of Fit 67.73 33 2.05 2.92 0.1165 Not significant
Pure Error 3.51 5 0.7    
Cor. Total 2565.29 45     
Std. Dev. = 1.37   R-Squared = 0.9722
Mean = 16.24   Adj R-Squared = 0.9671
C.V. = 8.43   Pred R-Squared = 0.9599
PRESS = 102.79   Adeq Precision = 57.25