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Table 9 Analysis of variance for TWR (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 17.54 6 2.92 521.21 <0.0001 Significant
A 0.19 1 0.19 33.31 <0.0001  
B 8.60 × 10-03 1 8.60 × 10-03 1.53 0.223  
D 9.98 1 9.98 1779.24 <0.0001  
E 0.033 1 0.033 5.84 0.0204  
D2 7.29 1 7.29 1300.3 <0.0001  
BD 0.04 1 0.04 7.06 0.0114  
Residual 0.22 39 5.61 × 10-03    
Lack of Fit 0.21 34 6.19 × 10-03 3.71 0.0734 Not significant
Pure Error 8.34 × 10-03 5 1.67 × 10-03    
Cor. Total 17.76 45     
Std. Dev. = 0.075   R-Squared = 0.9877
Mean = 0.38   Adj R-Squared = 0.9858
C.V. = 19.89   Pred R-Squared = 0.983
PRESS = 0.3   Adeq Precision = 65.095