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Seasonal Unit Root Tests under Structural Breaks Author info | Abstract | Publisher info | Download info | Related research | Statistics Uwe Hassler () (Goethe-Universität Frankfurt am Main)
Paulo M. M. Rodrigues () (University of Algarve, Faculty of Economics Campus de Gambelas, Portugal)
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In this paper, several seasonal unit root tests are analysed in the context of structural breaks at known time and a new break corrected test is suggested. We show that the widely used HEGY test as well as an LM variant thereof are asymptotically robust to seasonal mean shifts of finite magnitude. In finite samples, however, experiments reveal that such tests suffer from severe size distortions and power reductions when breaks are present. Hence, a new break corrected LM test is proposed in order to overcome this problem. Importantly, the correction for seasonal mean shifts bears no consequence on the limiting distributions thereby maintaining the legitimacy of canonical critical values. Moreover, although this test assumes a breakpoint a priori, it is robust in terms of misspecification of the time of the break. This asymptotic property is well reproduced in finite samples. Based on a Monte Carlo study, our new test is compared with other procedures suggested in the literature and shown to hold superior finite sample properties.
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Paper provided by Institut für Volkswirtschaftslehre (Department of Economics), Technische Universität Darmstadt (Darmstadt University of Technology) in its series Darmstadt Discussion Papers in Economics with number
113.
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Length: 22 pages
Date of creation: Nov 2002Date of revision:
Handle: RePEc:tud:ddpiec:113Contact details of provider: Postal: Hochschulstr. 1, 64289 Darmstadt Web page: http://www.bwl.tu-darmstadt.de/vwl/ More information through EDIRC
For technical questions regarding this item, or to correct its listing, contact: (Andreas Röthig).
Keywords: Structural Breaks ; Unit Roots ; Seasonal Unit Root Tests ; Other versions of this item:
Find related papers by JEL classification: C12 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods: General - - - Hypothesis Testing C22 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Time-Series Models; Dynamic Quantile Regressions
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references Cited by : (explanations , Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile , click on "citations" and make appropriate adjustments.)
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Uwe Hassler & Paulo M. M. Rodrigues, 2002.
"Seasonal Unit Root Tests under Structural Breaks ,"
Darmstadt Discussion Papers in Economics
113, Institut für Volkswirtschaftslehre (Department of Economics), Technische Universität Darmstadt (Darmstadt University of Technology).
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"Finite sample effects of pure seasonal mean shifts on Dickey-Fuller tests ,"
MPRA Paper
125, University Library of Munich, Germany, revised May 2006.
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