Table 6 Variance analysis for response index Y2.

From: Dynamic sealing simulation and performance optimization of conical rubber core in rotary blowout preventer

Source

Sum of squared deviations

Degree of freedom

Mean square

F value

P value

R2

Model

47.02

9

5.22

62.38

< 0.0001

0.9877

A

8.30

1

8.30

99.13

< 0.0001

B

1.11

1

1.11

13.25

0.0083

C

5.76

1

5.76

68.81

< 0.0001

AB

3.44

1

3.44

41.08

0.0004

AC

0.0361

1

0.0361

0.4310

0.5325

BC

1.70

1

1.70

20.33

0.0028

A2

5.02

1

5.02

59.89

0.0001

B2

7.05

1

7.05

84.17

< 0.0001

C2

11.91

1

11.91

142.14

< 0.0001

Residual

0.5863

7

0.0838

Lack of fit

0.4210

3

0.1403

3.40

0.1342

Pure error

0.1653

4

0.0413

Total deviation

47.61

16