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Table 4 Analysis of variance for mean roughness depth Ra (µm) (reduced quadratic model)

From: Application of response surface methodology for prediction and modeling of surface roughness in ball end milling of OFHC copper

Source

DF

Sum of squares

Adj. mean square

F value

p value

Cont. %

Remarks

Regression

12

0.7068

0.05890

1068.48

0.000

 

Significant

Linear

4

0.3425

0.08564

1553.50

0.000

  

f z

1

0.0051

0.00510

92.59

0.000

0.72

Significant

a p

1

0.0126

0.01260

228.64

0.000

1.78

Significant

a e

1

0.3243

0.32434

5883.60

0.000

45.81

Significant

V c

1

0.0005

0.00050

9.15

0.007

0.07

Significant

Square

4

0.3539

0.08850

1605.34

0.000

  

fz × fz

1

0.1032

0.10320

1872.09

0.000

14.58

 

ap × ap

1

0.0828

0.08284

1502.82

0.000

11.69

 

ae × ae

1

0.1612

0.16117

2923.69

0.000

22.77

 

Vc × Vc

1

0.1165

0.11649

2113.11

0.000

16.46

 

Interaction

4

0.0103

0.00257

46.00

0.000

  

fz × ae

1

0.0076

0.00766

138.89

0.000

1.07

 

fz × Vc

1

0.0018

0.00181

32.77

0.000

0.25

 

ap × ae

1

0.0003

0.00031

5.56

0.030

0.04

 

ae × Vc

1

0.0005

0.00051

9.18

0.007

0.07

 

Error

18

0.0009

0.00005

    

Lack-of-fit

12

0.0008

0.00068

2.39

0.146

 

Not significant

Pure error

6

0.0002

0.00003

    

Total

30

0.7078

     
     

R 2

 

0.9986

     

\( {R}_{adj.}^2 \)

 

0.9977