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Title:Panel unit root tests in the presence of a multifactor error structure PDF Logo
Authors:Pesaran, Mohammad Hashem
Smith, L. Vanessa
Yamagata, Takashi
Issue Date:2007
Series/Report no.:IZA Discussion Papers 3254
Abstract:This paper extends the cross sectionally augmented panel unit root test proposed by Pesaran (2007) to the case of a multifactor error structure. The basic idea is to exploit information regarding the unobserved factors that are shared by other time series in addition to the variable under consideration. Importantly, our test procedure only requires specification of the maximum number of factors, in contrast to other panel unit root tests based on principal components that require in addition the estimation of the number of factors as well as the factors themselves. Small sample properties of the proposed test are investigated by Monte Carlo experiments, which suggest that it controls well for size in almost all cases, especially in the presence of serial correlation in the error term, contrary to alternative test statistics. Empirical applications to Fisher's inflation parity and real equity prices across different markets illustrate how the proposed test works in practice.
Subjects:Panel unit root tests
cross section dependence
multi-factor residual structure
Fisher inflation parity
real equity prices
JEL:C12
Document Type:Working Paper
Appears in Collections:IZA Discussion Papers, Forschungsinstitut zur Zukunft der Arbeit (IZA)

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