Model

R

R²

Adjusted R²

Standard error of estimate

Shaanxi

0.928^a

0.861

0.814

53,001.881

Gansu

0.938^a

0.880

0.840

8164.055

Qinghai

0.520^a

0.270

0.027

4775.666

Ningxia

0.844^a

0.713

0.617

8744.134

Xinjiang

0.402^a

0.162

−0.118

50,856.252