An Improved Nonlinear Grey Bernoulli Model Combined with Fourier Series

Table 2

The parameter evaluation of the fitting models.

Model	Parameter value
GM (1, 1)	= 0, = 0.5
Optimized GM (1, 1)	= 0, = 0.001
Original NGBM (1, 1)	= 0.0381, = 0.5
Optimized NGBM (1, 1)	= 0.0385, = 0.001
F-NGBM (1, 1)	= 0.0381, = 0.5