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The Role of Alternative Methodology on the Relation between Portfolio Size and Diversification

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  • Beck, Kristine L
  • Perfect, Steven B
  • Peterson, Pamela P

Abstract

An important concern in portfolio management is the number of securities needed to create a well-diversified portfolio. The number of securities that constitute a well-diversified portfolio, however, varies widely among studies. It is demonstrated that past conclusions are highly sensitive to the methodology used in quantifying diversification. This finding motivates the development of alternative methods that reduce the effect of repeated replications on test results. The first approach exploits the power curves of statistical tests, whereas the second approach suggests the use of more robust statistics. Both approaches provide researchers with guidance in the design of future diversification studies. Copyright 1996 by MIT Press.

Suggested Citation

  • Beck, Kristine L & Perfect, Steven B & Peterson, Pamela P, 1996. "The Role of Alternative Methodology on the Relation between Portfolio Size and Diversification," The Financial Review, Eastern Finance Association, vol. 31(2), pages 381-406, May.
    • Handle: RePEc:bla:finrev:v:31:y:1996:i:2:p:381-406
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    Cited by:

    1. Vitali Alexeev & Mardi Dungey, 2015. "Equity portfolio diversification with high frequency data," Quantitative Finance, Taylor & Francis Journals, vol. 15(7), pages 1205-1215, July.
    2. Vitali Alexeev & Francis Tapon, 2014. "The number of stocks in your portfolio should be larger than you think: diversification evidence from five developed markets," Published Paper Series 2014-4, Finance Discipline Group, UTS Business School, University of Technology, Sydney.
    3. Haensly, Paul J., 2022. "Lessons from naïve diversification about the risk-reward trade-off," The North American Journal of Economics and Finance, Elsevier, vol. 59(C).
    4. Alexeev, Vitali & Tapon, Francis, 2013. "Equity Portfolio Diversification: How Many Stocks are Enough? Evidence from Five Developed Markets," Working Papers 2013-16, University of Tasmania, Tasmanian School of Business and Economics, revised 20 Nov 2013.
    5. Prateek Sharma & Vipul, 2018. "Improving portfolio diversification: Identifying the right baskets for putting your eggs," Managerial and Decision Economics, John Wiley & Sons, Ltd., vol. 39(6), pages 698-711, September.
    6. Namwon Hyung & Casper G. de Vries, 2010. "The Downside Risk of Heavy Tails induces Low Diversification," Tinbergen Institute Discussion Papers 10-082/2, Tinbergen Institute.
    7. Reis, Pedro Nogueira & Pinto, António Pedro Soares, 2024. "Unlocking portfolio resilient and persistent risk: A holistic approach to unveiling potential grounds," The North American Journal of Economics and Finance, Elsevier, vol. 73(C).
    8. Nuhiu Artor & Aliu Florin & Peci Bedri, 2022. "Assessing the diversification risk of a single equity market: evidence from the largest European stock indexes," International Journal of Management and Economics, Warsaw School of Economics, Collegium of World Economy, vol. 58(1), pages 3-16, March.
    9. Azra Zaimovic & Adna Omanovic & Almira Arnaut-Berilo, 2021. "How Many Stocks Are Sufficient for Equity Portfolio Diversification? A Review of the Literature," JRFM, MDPI, vol. 14(11), pages 1-30, November.
    10. Haensly, Paul J., 2020. "Risk decomposition, estimation error, and naïve diversification," The North American Journal of Economics and Finance, Elsevier, vol. 52(C).
    11. Prateek SHARMA, 2017. "Economic value of portfolio diversification: Evidence from international multi-asset portfolios," Theoretical and Applied Economics, Asociatia Generala a Economistilor din Romania / Editura Economica, vol. 0(4(613), W), pages 33-42, Winter.
    12. David Bradfield & Brian Munro, 2017. "The number of stocks required for effective portfolio diversification: the South African case," South African Journal of Accounting Research, Taylor & Francis Journals, vol. 31(1), pages 44-59, January.

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