Two Novel Grey System Models and Their Applications on Landslide Forecasting

Table 2

Simulation by GM() and GGM().

Month	Actual value	GM()	Actual value − 100000	GM()	GGM()
Jan	162818	162818	62818	62818	62818
Feb	214523	200801	114523	102462	100801
Mar	201184	193817	101184	94260	93817
Apr	155942	187077	55942	86714	87077
May	183216	180571	83216	79773	80571
Jun	165935	174291	65935	73386	74291
Jul	175836	168229	75836	67512	68229
Aug	170885	162379	70885	62107	62379
MAPE (%)		0.67		1.39	1.43