Agricultural and Food Economics

Table 1 Unit root tests ^a

From: Price relations between international rice markets

Export Price	Level				First-difference
Export Price	ADF	PP	ZA	Structural break	ADF	PP
Thailand 5%	-3.380*	-2.884	-6.552***	2008 m02	-7.556***	-7.264***
Vietnam 5%	-3.804**	-2.796	-6.017***	2008 m02	-7.251***	-5.923***
Pakistan 25%	-3.794**	-2.813	-5.692***	2007 m09	-7.123***	-7.096***
U.S 2-4%	-3.102	-2.589	-4.141	2007 m09	-6.984***	-7.025***
Argentina 10%	-2.808	-2.422	-4.001	2007 m07	-7.818***	-7.707***

^a The time period of the price series is from January 2000 to May 2013. The prices are in their logarithmic transformations. A trend and intercept were included in the unit root tests. *, **, ***, signify a ten, five, and one percent level of significance of the unit root tests.

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