A Grey Seasonal Index Model for Forecasting Groundwater Depth of Ningxia Plain

Table 11

The parameters of the GSIM (1,1) model fitting process in Weining Plain.

Modeling the serial number	The optimal order number r
1	1.39	−0.08	1.62
2	0.52	0.21	0.94
3	0.55	0.17	0.91
4	0.52	0.17	0.86
5	0.14	0.50	0.81
6	1.59	−0.18	1.22
7	1.56	−0.17	0.97
8	1.77	−0.24	0.92
9	1.44	−0.18	0.81
10	0.42	0.44	1.08
11	0.47	0.37	1.13
12	0.88	0.01	0.60