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Table 7 Provincial K-means clustering results for the technology gap ratio (TGR) of hydropower in China’s three regions

From: Energy efficiency in China: optimization and comparison between hydropower and thermal power

DMU K-means clustering
Eastern region
 Beijing 1
 Hebei 1
 Liaoning 1
 Jiangsu 1
 Zhejiang 2
 Fujian 2
 Shandong 1
 Guangdong 1
 Hainan 1
Central region
 Shanxi 1
 Inner Mongolia 1
 Jilin 1
 Heilongjiang 1
 Anhui 1
 Jiangxi 1
 Henan 1
 Hubei 2
 Hunan 1
 Guangxi 1
Western region
 Chongqing 1
 Sichuan 1
 Guizhou 1
 Yunnan 1
 Shaanxi 1
 Gansu 1
 Qinghai 1
 Ningxia 1
 Xinjiang 1
  1. “1” means the group with higher TGR values, and “2” means the group with lower TGR values. The data are from the authors’ collection