Research Article
Operational and Environmental Efficiencies of Japanese Electric Power Companies from 2003 to 2015: Influence of Market Reform and Fukushima Nuclear Power Accident
Table 4
Kruskal-Wallis rank sum test.
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Note. The values represent chi-squared statistics with consideration of ties; d.f. means degrees of freedom. Symbols and indicate statistical significance at the level of 1% and 5%, respectively. |