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

Table 5

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

Modeling the serial number	The optimal order number r
1	1.21	−0.05	1.08
2	0.99	0.05	1.24
3	0.15	0.89	1.40
4	1.13	−0.03	1.35
5	1.10	−0.04	1.28
6	1.10	−0.05	0.90
7	1.11	−0.07	0.77
8	1.25	−0.07	0.87
9	1.58	−0.19	1.11
10	0.54	0.18	0.83
11	0.57	0.17	0.95
12	0.98	−0.05	0.55