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

Table 12

Seasonal index fitting value of Weining Plain groundwater depth.

Month	Year
	2014	2015	2016	2017	2018
1	1.20	1.32	1.10	1.05	1.05
2	1.17	1.18	1.21	1.20	1.17
3	1.21	1.20	1.24	1.26	1.24
4	1.23	1.19	1.22	1.23	1.22
5	1.17	1.18	1.19	1.18	1.17
6	0.88	0.99	0.82	0.87	0.99
7	0.77	0.78	0.67	0.72	0.81
8	0.72	0.69	0.56	0.67	0.82
9	0.79	0.70	0.69	0.76	0.87
10	0.81	1.06	1.09	1.05	0.99
11	1.04	1.17	1.18	1.13	1.06
12	1.01	0.71	0.72	0.74	0.75
MAPE	2.23