Analyzing the Relationship between the PM_2.5 Concentration and the Gini Coefficient Using the Grey Model

Table 2

The result of the CFNGM (1, 1) model in two provinces.

Year	Jiangsu			Shaanxi
	Gini coefficient	PM2.5	CFNGM (1, 1)	Gini coefficient	PM2.5	CFNGM (1, 1)
2006	0.369	53.7	53.7	0.461	56.1	56.1
2007	0.371	61.1	62.1	0.459	56.1	58.1
2008	0.372	57.5	62.3	0.462	47.8	58.1
2009	0.377	66.2	62.7	0.456	57.8	58.0
2010	0.378	61.7	63.2	0.456	64.4	58.0
2011	0.354	66.6	61.6	0.405	67.5	57.6
2012	0.350	56.3	59.6	0.404	61.2	57.2
2013	0.363	59.2	60.2	0.399	61.4	57.2
2014	0.345	62.5	59.9	0.387	54.3	57.0
2015	0.351	58.6	59.1	0.404	47.0	57.1
MAPE	—	—	4.67%	—	—	9.07%
2016	0.338	50.2	58.6	0.403	51.1	57.2
MAPE	—	—	3.78%	—	—	8.98%