Construction of Grain Price Determinants Analysis Model Based on Structural Vector Autoregressive Model

Table 2

Data stability test.

Variables	ADF test	PP test	KPSS level	KPSS trend
Production (corn)	−6.68	−189.63	0.017	0.018
Production (wheat)	−5.48	−208	0.028	0.027
Production (soybean)	−6.47	−203.97	0.023	0.023
Production (rice)	−7.82	−211.12	0.047	0.033
Demand	−7.16	−187.24	0.053	0.046
Exchange	−5.61	−132.53	0.38	0.042
Inventory (corn)	−6.32	−132.53	0.13	0.033
Inventory (wheat)	−6.66	−237.54	0.32	0.042
Inventory (soybean)	−6.36	−203.27	0.059	0.017
Inventory (rice)	−4.57	−255.45	0.059	0.041
Price (corn)	−6.54	−176.08	0.17	0.045
Price (wheat)	−5.19	−165.06	0.10	0.042
Price (soybean)	−6.39	−126.04	0.13	0.029
Price (rice)	−6.86	−120.84	0.12	0.053

, , and indicate the significance at the statistical levels of 10%, 5%, and 1%, respectively.