Journal of Electrical Systems and Information Technology

Table 6 Percentage forecast errors associated with the various models for energy data for a photocopier

From: Improvement of Grey System Model using Particle Swarm Optimization

	PSO-GM(1,1)	GM(1,1)	Method in [18]	Method in [19]
	1.0143	1.0516	7.2695	1.7258
	– 0.6257	– 0.5890	2.5204	0.0963
	1.2435	1.2782	1.0707	1.9509
	– 0.7202	– 0.6860	– 4.3350	0
MAPE	0.9009	0.9012	3.7989	0.9433

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