Table 4 Test of gray prediction model from 2004 to 2020.

From: Spatial adaptation patterns and coordinated development of water-energy-food complex system in the yellow river basin

Region

RMSE

Variance ratio C test

Small error probability P test

Qinghai

0.0071

0.275

0.706

Sichuan

0.0065

0.315

0.706

Gansu

0.0098

0.217

0.765

Ningxia

0.0043

0.160

0.824

Inner Mongolia

0.0040

0.133

0.998

Shaanxi

0.0058

0.300

0.824

Shanxi

0.0048

0.251

0.824

Henan

0.0099

0.793

0.647

Shandong

0.0076

0.256

0.765

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