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Testing Stationarity for Unobserved Components Models

  • James Morley

    ()

    (School of Economics, The University of New South Wales)

  • Irina B. Panovska

    (Washington University in St. Louis)

  • Tara M. Sinclair

    ()

    (the George Washington University)

Unobserved components (UC) models are widely used to estimate stochastic trends in macroeconomic time series, with the existence of a stochastic trend typically motivated by a stationarity test. However, given the small sample sizes available for most macroeconomic variables, standard Lagrange multiplier tests of stationarity will perform poorly when the data are highly persistent. To address this problem, we propose the alternative use of a likelihood ratio test of stationarity based on a UC model and demonstrate that a bootstrap version of this test has far better small-sample properties for empirically-relevant data generating processes than bootstrap versions of the standard tests. An application to U.S. real GDP produces stronger support for the presence of large permanent shocks when using the likelihood ratio test as compared to standard tests.

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File URL: http://research.economics.unsw.edu.au/RePEc/papers/2012-41.pdf
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Paper provided by School of Economics, The University of New South Wales in its series Discussion Papers with number 2012-41A.

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Length: 30 pages
Date of creation: May 2013
Date of revision:
Handle: RePEc:swe:wpaper:2012-41a
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