This paper presents asymptotic results for the seasonal unit root test proposed by Hylleberg, Engle, Granger and Yoo (1990, Journal of Econometrics 44, 215 238) in a near integration context. The findings are important in that they provide the asymptotic power functions of the Hylleberg et al. statistics when the characteristic roots of a seasonal process are local to unity. These conclusions extend the available asymptotic results for this test and serve as a framework for the potential development of more powerful test procedures.
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Article provided by Cambridge University Press in its journal Econometric Theory.
Volume (Year): 17 (2001) Issue (Month): 01 (February) Pages: 70-86 Download reference. The following formats are available: HTML
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