Figure 8 | Scientific Reports

Figure 8

From: A modified dynamic DEA model to assess the wastewater treatment efficiency: perspective from Yangtze River and Non-Yangtze River Basin

Figure 8

Natural log values of COD, NOE, TNE, TPE, and PE from 29 provinces in China in Stage 2*. *Source: Compiled by the authors themselves based on the data collected. In order to avoid absolute differences among the indicators and the influence of individual extreme values, we process the natural logarithm of the indicator values. The comparison between different variables and the same variable is also facilitated by this method, and the raw data are detailed in the “Supplementary material”. (a) Natural log values of COD, NOE, TNE, TPE, and PE from 29 provinces in China in 2018. (b) Natural log values of COD, NOE, TNE, TPE, and PE from 29 provinces in China in 2019. (c) Natural log values of COD, NOE, TNE, TPE, and PE from 29 provinces in China in 2020.

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