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Table 3 The sequential model fitting summary for the actual responses which shows statistics conformation of the regression process, DF is degree of freedom

From: Optimizing Bi2O3 and TiO2to achieve the maximum non-linear electrical property of ZnO low voltage varistor

Source

Sum of squares

DF

Mean square

F-Value

p-value

Remark

Sequential model sum of squares

     

Mean vs Total

2064.18

1

2064.18

-

-

 

Linear vs Mean

12.07

2

6.04

0.13

0.8818

 

2FI vs Linear

22.31

1

22.31

0.44

0.5216

 

Quadratic vs 2FI

447.11

2

223.55

356.58

< 0.0001

Suggested

Cubic vs Quadratic

1.56

2

0.78

1.38

0.3325

Aliased

Residual

2.83

5

0.57

-

-

 

Total

2550.06

13

196.16

-

-

 

Source

Sum of squares

DF

Mean square

F-Value

p-value

Remark

Lack of fit tests

      

Linear

472.78

6

78.80

307.73

< 0.0001

 

2FI

450.47

5

90.09

351.85

< 0.0001

 

Quadratic

3.36

3

1.12

4.38

0.0938

Suggested

Cubic

1.80

1

1.80

7.03

0.0569

Aliased

Pure Error

1.02

4

0.26

-

-

 

Source

Std.Dev.

R Adj

R Pred

R

PRESS

Remark

Model summary statistics

      

Linear

6.88

0.025

-0.170

-0.571

763.55

 

2FI

7.08

0.071

-0.239

-1.195

1066.45

 

Quadratic

0.79

0.991

0.985

0.947

25.53

Suggested

Cubic

0.75

0.994

0.986

0.760

116.85

Aliased