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An Empirical Re-Examination of the Weak Form Efficient Markets Hypothesis of the Ghana Stock Market Using Variance-Ratios Tests

Author

Listed:
  • Collins G. Ntim
  • Kwaku K. Opong
  • Jo Danbolt

    (University of Glasgow)

Abstract

This study empirically re-examines the weak form efficient markets hypothesis of the Ghana Stock Market using a new robust non-parametric variance-ratios test in addition to its parametric alternative. The main finding is that stock returns are conclusively not efficient in the weak form, neither from the perspective of the strict random walk nor in the relaxed martingale difference sequence sense. Unlike previous evidence, our finding is robust to thin-trading, sub-sample periods as well as the choice of dataset. Consistent with prior studies, the results of the parametric variance-ratios test are ambiguous. By contrast, its non-parametric alternative provides conclusive results.

Suggested Citation

  • Collins G. Ntim & Kwaku K. Opong & Jo Danbolt, 2007. "An Empirical Re-Examination of the Weak Form Efficient Markets Hypothesis of the Ghana Stock Market Using Variance-Ratios Tests," The African Finance Journal, Africagrowth Institute, vol. 9(2), pages 1-25.
    • Handle: RePEc:afj:journl:v:9:y:2007:i:2:p:1-25
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    Citations

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    Cited by:

    1. Graham Smith & Aneta Dyakova, 2014. "African Stock Markets: Efficiency and Relative Predictability," South African Journal of Economics, Economic Society of South Africa, vol. 82(2), pages 258-275, June.
    2. Fifield, Suzanne G.M. & Jetty, Juliana, 2008. "Further evidence on the efficiency of the Chinese stock markets: A note," Research in International Business and Finance, Elsevier, vol. 22(3), pages 351-361, September.
    3. Ntim, Collins G. & English, John & Nwachukwu, Jacinta & Wang, Yan, 2015. "On the efficiency of the global gold markets," International Review of Financial Analysis, Elsevier, vol. 41(C), pages 218-236.
    4. Emenike, Kalu O., 2008. "Efficiency across Time: Evidence from the Nigerian Stock Exchange," MPRA Paper 22901, University Library of Munich, Germany.
    5. Alagidede, Paul & Baah-Boateng, William & Nketiah-Amponsah, Edward, 2013. "The Ghanian economy: and Overview," MPRA Paper 109687, University Library of Munich, Germany.

    More about this item

    Keywords

    Weak Form Efficiency; Random Walk; Martingale Difference Sequence; Parametric and Non-Parametric Variance-Ratios Tests; Ghana Stock Market;
    All these keywords.

    JEL classification:

    • G11 - Financial Economics - - General Financial Markets - - - Portfolio Choice; Investment Decisions
    • G12 - Financial Economics - - General Financial Markets - - - Asset Pricing; Trading Volume; Bond Interest Rates
    • G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies; Insider Trading

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