An Improved Nonlinear Grey Bernoulli Model Based on the Whale Optimization Algorithm and Its Application

Table 4

Parameter values for five grey models.

Parameters
GM (1, 1)	−0.155	464.614	0.500
DGM (1, 1)					1.168	503.98
NGBM (1, 1)	−0.138	247.382	0.500	0.094
ONGBM (1, 1)	−0.137	238.140	0.510	0.100
INGBM (1, 1)	−0.133	216.435	0.500	−0.115			−0.133	216.685