Discrete Particle Swarm Optimization with Scout Particles for Library Materials Acquisition

Table 6

Results of different constraints handlings on two test cases.

Case	Measure	Improvement		Execution time
		Accept	Reject	Accept	Reject
I	Average	52.81%	51.76%	1.6610	1.5802
	Stdev	0.2826	0.2773	1.4622	1.4135
	Observations	480	480	480	480
	z-score	0.5825		0.8703
	P value	0.5603		0.3841
II	Average	72.85%	71.48%	803.15	777.82
	Stdev	0.3693	0.3705	310.83	331.79
	Observations	160	160	160	160
	z-score	0.3304		0.7047
	P value	0.7410		0.4810