Nonlinear Grey Prediction Model with Convolution Integral NGMC (1,𝑛) and Its Application to the Forecasting of China’s Industrial SO₂ Emissions

Table 4

The modelling values and forecasts of China’s industrial SO₂ emissions by GMC (1, 2).

Time	Modelling values or forecast	Observations	Percent errors (%)
1 (2003)	2158.50	2158.50	0.00
2 (2004)	2195.32	2254.90	−2.64
3 (2005)	2367.35	2549.40	−7.14
4 (2006)	2398.87	2588.80	−7.34
5 (2007)	2110.67	2468.09	−14.48
6 (2008)	1205.64	2321.23	−48.06
7 (2009)	−630.24	2214.40	−128.46
8 (2010)	−4153.31	2185.15	−290.07