Water environmental efficiency in different urban spatial structure patterns: Evidence from a panel of Chinese urban districts

Spatial-Temporal Evolution and Convergence Analysis of Urban Environmental Efficiency in China’s Coastal Areas Based on Undesirable Output

“…The second is the nonparametric method, namely Data Envelopment Analysis and its derivative models [12][13][14][15][16]. The second is the spatial-temporal evolution of EE [17][18][19] and the spatial difference [7,20,21]. There are spatial correlations and spatial heterogeneity in EE across regions or industries.…”