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Covariance Stationarity of International Equity Markets Returns: Recent Evidence


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  • Wahab, Mahmoud
  • Lashgari, Malek
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    Intertemporal stationarity tests of the variance-covariance matrix of monthly returns on seven international equity indices are conducted over the most recent period. Pairwise covariances are then decomposed into their component statistics for further examination of the source(s) of stationarity or nonstationarity. Historical analysis reveals that pairwise covariances were invariably highly nonstationary over forecast intervals that varied in length between one month and five years. Reliance on historical covariances to estimate future covariances over a hold-out sample produced suboptimal results in comparison to an alternative naive forecasting model. These findings were robust in that they were invariant to whether nominal or real returns were used. Evidence on the intertemporal stationarity of the vector of mean returns is also provided. Copyright 1993 by MIT Press.

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    Bibliographic Info

    Article provided by Eastern Finance Association in its journal The Financial Review.

    Volume (Year): 28 (1993)
    Issue (Month): 2 (May)
    Pages: 239-60

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    Handle: RePEc:bla:finrev:v:28:y:1993:i:2:p:239-60

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    Cited by:
    1. Kearney, Colm & Lucey, Brian M., 2004. "International equity market integration: Theory, evidence and implications," International Review of Financial Analysis, Elsevier, vol. 13(5), pages 571-583.
    2. Tang, Gordon Y. N., 1996. "Intervalling Effect on Intertemporal Stability among Asian Emerging Markets and Developed Markets," Journal of Business Research, Elsevier, vol. 36(3), pages 257-265, July.
    3. M. Barari & Brian Lucey & S. Voronkova, 2008. "Reassessing co-movements among G7 equity markets: evidence from iShares," Applied Financial Economics, Taylor & Francis Journals, vol. 18(11), pages 863-877.
    4. Vo, Xuan Vinh, 2009. "International financial integration in Asian bond markets," Research in International Business and Finance, Elsevier, vol. 23(1), pages 90-106, January.
    5. Bracker, Kevin & Koch, Paul D., 1999. "Economic determinants of the correlation structure across international equity markets," Journal of Economics and Business, Elsevier, vol. 51(6), pages 443-471.


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