Multiobjective Simulation-Based Optimization Based on Artificial Immune Systems for a Distribution Center

Table 4

Spacing and error ratio values generated by the five algorithms (the best results are bolded).

	SCMIA	MISA	NNIA	NSGA-II	SPEA2
	Mean; (Standard Deviation)
Error Ratio (ER)	0.71 (0.10)	0.85 (0.16)	0.78 (0.18)	0.76 (0.14)	0.74 (0.06)
Spacing ()	38.74 (10.97)	58.02 (55.82)	49.23 (26.10)	51.85 (17.58)	39.32 (37.16)