A Multifactory Integrated Production and Distribution Scheduling Problem with Parallel Machines and Immediate Shipments Solved by Improved Whale Optimization Algorithm

Table 6

Results of one-way ANOVA test for medium-scale instances.

	DF	SS	MS	-Value	-Value	Test results
IWOA-WOA	1	270.3	270.34	16.21	0.00	Means are significantly different
Error	72	1200.9	16.68
Total	73	1471.2
IWOA-GA	1	40.89	40.89	3.51	0.065	Means are equal
Error	72	839.14	11.65
Total	73	880.04
IWOA-PSO	1	0.396	0.396	0.04	0.839	Means are equal
Error	72	686.03	9.528
Total	73	686.43
GA-PSO	1	33.25	33.25	3.20	0.078	Means are equal
Error	72	747.25	10.38
Total	73	780.49

DF: degree of freedom; SS: sum of squares; MS: mean squares.