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Unit Root Testing under a Local Break in Trend using Partial Information on the Break Date

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  • David I. Harvey
  • Stephen J. Leybourne
  • A.M. Robert Taylor

Abstract

type="main" xml:lang="en"> We consider unit root testing allowing for a break in trend when partial information is available regarding the location of the break date. This takes the form of knowledge of a relatively narrow window of data within which the break takes place, should it occur at all. For such circumstances, we suggest employing a union of rejections strategy, which combines a unit root test that allows for a trend break somewhere within the window with a unit root test that makes no allowance for a trend break. Asymptotic and finite sample evidence shows that our suggested strategy works well, provided that, when a break does occur, the partial information is correct. An empirical application to UK interest rate data containing the 1973 ‘oil shock’ is also considered.

Suggested Citation

  • David I. Harvey & Stephen J. Leybourne & A.M. Robert Taylor, 2014. "Unit Root Testing under a Local Break in Trend using Partial Information on the Break Date," Oxford Bulletin of Economics and Statistics, Department of Economics, University of Oxford, vol. 76(1), pages 93-111, February.
    • Handle: RePEc:bla:obuest:v:76:y:2014:i:1:p:93-111
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    File URL: http://hdl.handle.net/10.1111/obes.12013
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    References listed on IDEAS

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    Cited by:

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    3. K. Moses Tule & O. Taiwo Ajilore, 2016. "On the stability of the money multiplier in Nigeria: Co-integration analyses with regime shifts in banking system liquidity," Cogent Economics & Finance, Taylor & Francis Journals, vol. 4(1), pages 1187780-118, December.
    4. Skrobotov, Anton, 2020. "Survey on structural breaks and unit root tests," Applied Econometrics, Russian Presidential Academy of National Economy and Public Administration (RANEPA), vol. 58, pages 96-141.

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