9a , in the simulation stage, the actual data showed an obvious trend of fluctuation, both GMVM(1,N) and D-SIRGM(1,N) were basically above the actual data curve.
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A novel grey model based on Susceptible Infected Recovered Model: A case study of COVD-19.
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However, GMVM(1,N) was a relatively stable straight line, D-SIRGM(1,N) showed a slight trend of fluctuation.