Model

Sum of Squares

Degree of freedom

Mean Square

F

Significance

Shaanxi

Regression

Residual

Total

1.040E11

1.686E10

1.209E11

2

6

8

5.202E10

2.809E9

18.519

0.003a

Gansu

Regression

Residual

Total

2.927E9

3.999E8

3.327E9

2

6

8

1.464E9

6.665E7

21.961

0.002a

Qinghai

Regression

Residual

Total

5.068E7

1.368E8

1.875E8

2

6

8

2.534E7

2.281E7

1.111

0.389a

Ningxia

Regression

Residual

Total

1.139E9

4.588E8

1.598E9

2

6

8

5.697E8

7.646E7

7.451

0.024a

Xinjiang

Regression

Residual

Total

2.994E9

1.552E10

1.851E10

2

6

8

1.497E9

2.586E9

0.579

0.589a