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

Table 7

The fitting value of Yinchuan Plain groundwater depth by GSIM (1,1) model (unit: m).

Month	Year
	2014	2015	2016	2017	2018
1	2.05	2.06	1.91	2.03	2.27
2	2.49	2.52	2.41	2.49	2.65
3	2.73	2.68	2.61	2.72	2.92
4	2.73	2.69	2.60	2.76	3.05
5	2.71	2.67	2.64	2.88	3.26
6	1.89	1.89	1.89	2.08	2.39
7	1.62	1.66	1.68	1.88	2.18
8	1.58	1.68	1.55	1.67	1.90
9	1.80	1.98	1.65	1.93	2.45
10	2.31	2.29	2.38	2.58	2.83
11	2.67	2.58	2.65	2.86	3.12
12	2.07	1.35	1.42	1.61	1.88
MAPE	2.08