Table 6 Variance analysis of regression equation.

From: Operating parameter optimization and experiment of spiral outer grooved wheel seed metering device based on discrete element method

Source

Sum of squares

df

Mean square

F value

P value

Model

45.84

9

5.09

12.36

< 0.0001

X1

12.16

1

12.16

28.52

0.0001

X2

10.54

1

10.54

24.39

0.0003

X3

1.63

1

1.63

3.85

0.0657

X1X2

1.54

1

1.54

2.68

0.1428

X1X3

1.29

1

1.29

2.42

0.1587

X2X3

0.78

1

0.78

0.32

0.6934

X12

3.87E-04

1

3.87E-04

5.32E-04

0.9952

X22

0.34

1

0.34

0.25

0.7214

X32

7.12

1

7.12

15.21

0.0027

Residual

5.83

14

0.42

  
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