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Journal of Mathematics
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2021
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Article
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Tab 2
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Research Article
Forecast of Freight Volume in Xi’an Based on Gray GM (1, 1) Model and Markov Forecasting Model
Table 2
Xi’an’s predicted freight volume from 2009 to 2013 based on the Gray GM (1, 1) model.
Year
Freight volume (
)
Predicted value (
)
Relative error (%)
2009
3.0606
2.6050
−14.87
2010
3.4323
3.0894
9.99
2011
3.9239
3.6325
−7.43
2012
4.4924
4.3272
−3.68
2013
5.0119
5.1615
2.98