A complementary test for ADF test with an application to the exchange rates returns
AbstractThis 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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Bibliographic InfoPaper provided by University Library of Munich, Germany in its series MPRA Paper with number 518.
Date of creation: 2005
Date of revision:
cumulative sums of squares; covariance nonstationary; exchange rate returns;
Find related papers by JEL classification:
- C22 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Time-Series Models; Dynamic Quantile Regressions; Dynamic Treatment Effect Models &bull Diffusion Processes
- F31 - International Economics - - International Finance - - - Foreign Exchange
- C12 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General - - - Hypothesis Testing: General
This paper has been announced in the following NEP Reports:
- NEP-ALL-2006-11-12 (All new papers)
- NEP-ECM-2006-11-12 (Econometrics)
- NEP-ETS-2006-11-12 (Econometric Time Series)
- NEP-IFN-2006-11-12 (International Finance)
- NEP-SEA-2006-11-12 (South East Asia)
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