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Using Panel Data to Construct Simple and Efficient Unit Root Tests in the Presence of GARCH


  • Westerlund, Joakim

    () (Department of Economics, School of Business, Economics and Law, Göteborg University)

  • Narayan, Paresh

    (Deakin University)


In search for more efficient unit root tests in the presence of GARCH, some researchers have recently turned their attention to estimation by maximum likelihood. However, although theoretically appealing, the new test is difficult to implement, which has made it quite uncommon in the empirical literature. The current paper offers a panel data based solution to this problem.

Suggested Citation

  • Westerlund, Joakim & Narayan, Paresh, 2009. "Using Panel Data to Construct Simple and Efficient Unit Root Tests in the Presence of GARCH," Working Papers in Economics 379, University of Gothenburg, Department of Economics.
  • Handle: RePEc:hhs:gunwpe:0379

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    References listed on IDEAS

    1. Moon, H.R.Hyungsik Roger & Perron, Benoit, 2004. "Testing for a unit root in panels with dynamic factors," Journal of Econometrics, Elsevier, vol. 122(1), pages 81-126, September.
    2. Jushan Bai & Serena Ng, 2004. "A PANIC Attack on Unit Roots and Cointegration," Econometrica, Econometric Society, vol. 72(4), pages 1127-1177, July.
    3. Li, W K & Ling, Shiqing & McAleer, Michael, 2002. " Recent Theoretical Results for Time Series Models with GARCH Errors," Journal of Economic Surveys, Wiley Blackwell, vol. 16(3), pages 245-269, July.
    4. Seo, Byeongseon, 1999. "Distribution theory for unit root tests with conditional heteroskedasticity1," Journal of Econometrics, Elsevier, vol. 91(1), pages 113-144, July.
    5. Levin, Andrew & Lin, Chien-Fu & James Chu, Chia-Shang, 2002. "Unit root tests in panel data: asymptotic and finite-sample properties," Journal of Econometrics, Elsevier, vol. 108(1), pages 1-24, May.
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    More about this item


    Panel Data; Unit Root Tests; GARCH;

    JEL classification:

    • C23 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Models with Panel Data; Spatio-temporal Models
    • G00 - Financial Economics - - General - - - General

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