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Testing for a unit root in a process exhibiting a structural break in the presence of GARCH errors

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Brooks, C. and Rew, A. (2002) Testing for a unit root in a process exhibiting a structural break in the presence of GARCH errors. Computational Economics, 20 (3). pp. 151-176. ISSN 1572-9974

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To link to this article DOI: 10.1023/A:1020945428824

Abstract/Summary

This paper considers the effect of GARCH errors on the tests proposed byPerron (1997) for a unit root in the presence of a structural break. We assessthe impact of degeneracy and integratedness of the conditional varianceindividually and find that, apart from in the limit, the testing procedure isinsensitive to the degree of degeneracy but does exhibit an increasingover-sizing as the process becomes more integrated. When we consider the GARCHspecifications that we are likely to encounter in empirical research, we findthat the Perron tests are reasonably robust to the presence of GARCH and donot suffer from severe over-or under-rejection of a correct null hypothesis.

Item Type:Article
Refereed:Yes
Divisions:Henley Business School > ICMA Centre
ID Code:24164
Publisher:Springer

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