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A complementary test for ADF test with an application to the exchange rates returns

  • Liew, Venus Khim-Sen
  • Lau, Sie-Hoe
  • Ling, Siew-Eng

This study shows that augmented Dickey-Fuller (ADF) test failed to detect covariance nonstationary series. Supportive of Ahamada (2004), this study finds that the cumulative sums of squares procedure in Inclán and Tiao (1994) is useful to complement the ADF test. As illustration, the ADF test indicates that there is no unit root in the returns of Japanese yen/US dollar, British pound/ US dollar and Swiss franc/US. However, the complementary test reveals that each of these returns contains heterogeneous variance. To sum, it can be concluded that these exchange rate returns are covariance nonstationary although there is no unit root.

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File URL: http://mpra.ub.uni-muenchen.de/518/1/MPRA_paper_518.pdf
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Paper provided by University Library of Munich, Germany in its series MPRA Paper with number 518.

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Date of creation: 2005
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Handle: RePEc:pra:mprapa:518
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  1. Kwiatkowski, D. & Phillips, P.C.B. & Schmidt, P., 1990. "Testing the Null Hypothesis of Stationarity Against the Alternative of Unit Root : How Sure are we that Economic Time Series have a Unit Root?," Papers 8905, Michigan State - Econometrics and Economic Theory.
  2. Phillips, P C B, 1987. "Time Series Regression with a Unit Root," Econometrica, Econometric Society, vol. 55(2), pages 277-301, March.
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