Comparison of Power Plants Efficiency among 73 Countries

Table 3

Results of Kruskal-Wallis and Mann-Whitney 𝑈 test of different scenarios.

Scenarios	Statistics	TE	PTE	SE
Europe, America, and Asia	Chi square	14.629	12.585	14.093
	Degrees of freedom	2	2	2
	𝑃 value	0.002^∗∗	0.006^∗∗	0.003^∗∗
Developed and developing countries	𝑍-value	−1.882	−2.285	−0.355
	𝑃 value	0.06^∗	0.022^∗∗	0.723
With and without CO2 emission	𝑍-value	−8.271	−7.735	−2.5
	𝑃 value	0.000^∗∗	0.000^∗∗	0.012^∗∗

TE: technical efficiency; PTE: pure technical efficiency; SE: scale efficiency. ∗∗Represents significant at 0.05 level and ∗represents significant at 0.10 level.