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Testing for Common Trends in Nonstationary Large Datasets

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  • Matteo Barigozzi
  • Lorenzo Trapani

Abstract

We propose a testing-based procedure to determine the number of common trends in a large nonstationary dataset. Our procedure is based on a factor representation, where we determine whether there are (and how many) common factors (i) with linear trends, and (ii) with stochastic trends. Cointegration among the factors is also permitted. Our analysis is based on the fact that those largest eigenvalues of a suitably scaled covariance matrix of the data corresponding to the common factor part diverge, as the dimension N of the dataset diverges, whilst the others stay bounded. Therefore, we propose a class of randomized test statistics for the null that the pth largest eigenvalue diverges, based directly on the estimated eigenvalue. The tests only requires minimal assumptions on the data-generating process. Monte Carlo evidence shows that our procedure has very good finite sample properties, clearly dominating competing approaches when no common trends are present. We illustrate our methodology through an application to the U.S. bond yields with different maturities observed over the last 30 years.

Suggested Citation

  • Matteo Barigozzi & Lorenzo Trapani, 2022. "Testing for Common Trends in Nonstationary Large Datasets," Journal of Business & Economic Statistics, Taylor & Francis Journals, vol. 40(3), pages 1107-1122, June.
    • Handle: RePEc:taf:jnlbes:v:40:y:2022:i:3:p:1107-1122
    DOI: 10.1080/07350015.2021.1901719
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    Cited by:

    1. Gianluca CubaddaTor Vergata & Marco MazzaliTor Vergata, 2024. "The vector error correction index model: representation, estimation and identification," The Econometrics Journal, Royal Economic Society, vol. 27(1), pages 126-150.
    2. Morten {O}rregaard Nielsen & Won-Ki Seo & Dakyung Seong, 2023. "Inference on common trends in functional time series," Papers 2312.00590, arXiv.org, revised Dec 2023.

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