The optimization of GM(2,1) model based on parameter estimation of grade difference format

TANG Liwei, LU Yayun

Systems Engineering - Theory & Practice ›› 2018, Vol. 38 ›› Issue (2) : 502-508.

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Systems Engineering - Theory & Practice ›› 2018, Vol. 38 ›› Issue (2) : 502-508. DOI: 10.12011/1000-6788(2018)02-0502-07

The optimization of GM(2,1) model based on parameter estimation of grade difference format

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