A joint test for structural stability and a unit root in autoregressions

Pitarakis, Jean-Yves (2012) A joint test for structural stability and a unit root in autoregressions Computational Statistics & Data Analysis, n/a, pp. 1-11. (doi:10.1016/j.csda.2012.07.027).


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A test of the joint null hypothesis of parameter stability and a unit root within an ADF style autoregressive specification whose entire parameter structure is potentially subject to a structural break at an unknown time period is developed. The proposed test is a useful diagnostic tool for assessing the interactions of breaks and unit root type of nonstationarities in time series, in addition to offering a powerful device for detecting changes in persistence. As a byproduct the limiting behaviour of a related Wald statistic designed to test solely the null of parameter stability in an environment with a unit root is also obtained. These distributions are free of nuisance parameters and easily tabulated. The finite sample properties of the tests are assessed through a series of simulations, and an application to macroeconomic data illustrates their usefulness

Item Type: Article
Digital Object Identifier (DOI): doi:10.1016/j.csda.2012.07.027
ISSNs: 0167-9473 (print)
Keywords: structural breaks, unit roots, nonlinear dynamics
Organisations: Economics
ePrint ID: 342406
Date :
Date Event
10 August 2012e-pub ahead of print
Date Deposited: 28 Aug 2012 16:23
Last Modified: 17 Apr 2017 16:41
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/342406

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