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Pitfalls and Opportunities: What Macroeconomists Should Know About Unit Roots

In: NBER Macroeconomics Annual 1991, Volume 6

  • John Y. Campbell
  • Pierre Perron

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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This chapter was published in:
  • Olivier Jean Blanchard & Stanley Fischer, 1991. "NBER Macroeconomics Annual 1991, Volume 6," NBER Books, National Bureau of Economic Research, Inc, number blan91-1, September.
  • This item is provided by National Bureau of Economic Research, Inc in its series NBER Chapters with number 10983.
    Handle: RePEc:nbr:nberch:10983
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