Table 8 ANOVA results of the adjusted mathematical model created for EWR.

From: Parametric optimization of graphite powder-mixed electrical discharge machining of Ni-Cr dental alloy by response surface methodology

Source

Degree of freedom

Adjusted sum of squares

Adjusted mean squares

F-value

P-value

Model

6

0.847189

0.141198

28.52

0

Linear

4

0.370657

0.092664

18.72

0

I

1

0.300309

0.300309

60.66

0

Ton

1

0.017195

0.017195

3.47

0.089

Toff

1

0.045603

0.045603

9.21

0.011

Dielectric

1

0.002962

0.002962

0.6

0.455

2-Way interaction

2

0.269451

0.134726

27.21

0

I*Ton

1

0.112103

0.112103

22.64

0.001

I*Toff

1

0.178579

0.178579

36.07

0

Error

11

0.054457

0.004951

  

Total

17

0.901645

   

R-sq = 93.96% and R-sq(adj) = 90.67%