Research Article
An Improved Grey Model with Time Power and Its Application
Table 1
The simulated results and indices by five grey models.
| Year | Raw data | GM(1,1) | DGM(1,1) | NHGM(1,1) | GM(1,1, ) | OGM(1,1, ) |
| | | | | | | | | | | | | | | 2005 | 3.39 | | | | | | 2006 | 4.16 | 4.06 | 4.07 | 4.51 | 4.16 | 4.37 | 2007 | 4.97 | 4.72 | 4.73 | 5.11 | 4.73 | 4.94 | 2008 | 5.57 | 5.49 | 5.51 | 5.85 | 5.48 | 5.42 | 2009 | 5.96 | 6.39 | 6.41 | 6.78 | 6.40 | 6.25 | 2010 | 7.45 | 7.44 | 7.46 | 7.94 | 7.48 | 7.42 | 2011 | 8.75 | 8.66 | 8.69 | 9.39 | 8.72 | 8.77 | 2012 | 10.23 | 10.07 | 10.11 | 11.20 | 10.11 | 10.19 | RMSE | | 0.21 | 0.20 | 0.60 | 0.20 | 0.15 | MAPE(%) | | 2.70 | 2.53 | 7.66 | 2.27 | 2.03 | 2013 | 11.6 | 11.72 | 11.77 | 13.46 | 11.65 | 11.62 | 2014 | 12.74 | 13.64 | 13.69 | 16.28 | 13.34 | 13.05 | RMSE | | 0.64 | 0.68 | 2.83 | 0.43 | 0.22 | MAPE(%) | | 4.06 | 4.46 | 21.89 | 2.58 | 1.32 |
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The bold values represent the RMSE and MAPE (%) of the model proposed in this paper for model evaluation in the example.
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