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Table 9 Paired sample t test results

From: Optimal design of proportional–integral controllers for stand-alone solid oxide fuel cell power plant using differential evolution algorithm

Method	Paired differences
Method	Mean	Correlation	T	df	Sig. (2-tailed)
DE-PSO	−.475895	−.196	−5.157	29	0.000
DE-IWO	−8.969086	−.047	−14.179	29	0.000
PSO-IWO	−8.493191	−.102	−13.133	29	0.000

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