[Retracted] Wheat Futures Prices Prediction in China: A Hybrid Approach

Table 1

Explanation of variables with expected sign and sources.

Variables	Definition	Exp. sign	Source
	Russian wheat futures prices	+	[25]
	Wheat futures prices	−	[16]
	Rice futures price	±	[26]
J	Real rate of interest	−	[6]
Basis	Distinction among the mark and prospect costs of wheat	−	[6]
R	Wheat future price ratio (high to low)	+	[27]