Non-equidistance DGM(1, 1) Model Based on the Concave Sequence and Its Application to Predict the China's Per Capita Natural Gas Consumption

Xinhai KONG, Yong ZHAO, Jiajia CHEN

Journal of Systems Science and Information . 2018, (4): 376 -384 . DOI: 10.21078/JSSI-2018-376-09