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Journal of Mathematics
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2021
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Article
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Tab 3
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Research Article
Using the Quarterly Compound Fractional Grey Model to Predict the Air Quality in 22 Cities of China
Table 3
Table of accuracy levels for MAPE values.
Precision grade
Level 1
Level 2
Level 3
Level 4
MAPE
0-1%
1%–5%
5%–10%
10%–20%