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

Table 3

The parameters of the DGGM (1,1) model fitting process.

Modeling the serial number	Grey development coefficient	Grey action quantity
1	−0.039	1.838
2	−0.019	2.381
3	−0.026	2.539
4	−0.047	2.395
5	−0.072	2.279
6	−0.085	1.574
7	−0.101	1.337
8	−0.043	1.495
9	−0.086	1.53
10	−0.075	2.003
11	−0.069	2.263
12	−0.116	0.992