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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