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.

	EEV	EEC	SEE	OEV	OEC	SOE
Hypothesis 1; Periods, d.f. = 12	7.854	4.934	5.646			13.78
Hypothesis 2; Companies, d.f. = 8

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.