Table 4. Principal component analysis results and corresponding weights.

Province	Comp.1	Comp.2	Comp.3	Comp.4
Inner Mongolia	2.73	3.39	0.52	0.46
Xinjiang	2.37	-0.27	0.38	-0.07
Shandong	-2.69	1.74	-0.98	-1.41
Hebei	-1.07	-0.5	-0.76	0.77
Sichuan	-1.7	-0.6	3.44	-0.27
Henan	-2.94	0.21	-0.66	1.36
Gansu	2.95	-1.45	-0.08	-0.25
Yunnan	0.9	-0.97	-0.52	0.2
Anwei	0.44	-0.87	-1.76	-0.55
Hunan	-0.98	-0.67	0.41	-0.25
Weight	0.48	0.22	0.20	0.06