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Pitfalls and Opportunities: What Macroeconomists Should Know about Unit Roots

  • Campbell, John
  • Perron, Pierre

This paper is an introduction to unit root econometrics as applied in macroeconomics. The paper first discusses univariate time series analysis, emphasizing the following topics: alternative representations of unit root processes, unit root testing procedures, the power of unit root tests, and the interpretation of unit root econometrics in finite samples. A second part of the paper tackles similar issues in a multivariate context where cointegration is now the central concept. The paper reviews representation, testing, and estimation of multivariate time series models with some unit roots. Two important themes of this paper are first, the importance of correctly specifying deterministic components of the series, and second, the usefulness of unit root tests not as methods to uncover some "true relation" but as practical devices that can be used to impose reasonable restrictions on the data and to suggest what asymptotic distribution theory gives the best approximation to the finite-sample distribution of coefficient estimates and test statistics.

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Paper provided by Harvard University Department of Economics in its series Scholarly Articles with number 3374863.

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Date of creation: 1991
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Publication status: Published in NBER Macroeconomics Annual
Handle: RePEc:hrv:faseco:3374863
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