Journal of Electrical Systems and Information Technology

Table 5 Percentage forecast errors for energy data for a printer, associated with the various models

From: Improvement of Grey System Model using Particle Swarm Optimization

	PSO-GM(1,1)	GM(1,1)	Method in [18]	Method in [19]
	– 3.213	– 10.296	6.408	– 2.159
	4.521	0.188	2.380	7.551
	– 25.879	– 28.731	– 45.114	– 19.233
	0.041	0.000	– 29.927	7.378
MAPE	8.414	9.080	20.957	9.804

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