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Abstract

Securities selection is the attempt to distinguish prospective winners from losers – conditional on beliefs and available information. This article surveys some relevant academic research on the subject, including work about the combining of forecasts (Operational Research Quarterly 20, 451–468, 1969), the Black-Litterman model (Journal of Fixed Income 1(2), 7–18, 1991; Financial Analysts Journal (September/October) 28–43, 1992), the combining of Bayesian priors and regression estimates (Journal of Finance 55(1), 179–223, 2000), model uncertainty and Bayesian model averaging (Statistical Science 14(4), 382–417, 1999; Review of Financial Studies 15(4), 1223–1249, 2002), the theory of competitive storage (Review of Economic Studies 59, 1–23, 1992), and the combination of valuation estimates (Review of Accounting Studies 12(2–3), 227–256, 2007). Despite its wide-ranging applicability, the Bayesian approach is not a license for data snooping. The second half of this article describes common pitfalls in fundamental analysis and comments on the role of theoretical guidance in mitigating these pitfalls.

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Notes

  1. 1.

    The author’s equity-valuation students enrolled in an MBA elective at a leading business school choose to take weighted averages of their valuation estimates even though nothing in the class materials advises them to combine estimates. When asked why they do this, students report they learned to do this at work, other classes, or that weighing makes common sense. The students do not articulate how they determine their weights, and the weights vary greatly between students.

  2. 2.

    Net asset value is the liquidation value of assets minus the fair or settlement value of liabilities. Net asset value is not the same as accounting “book” value. Book value, because it derives from historical cost accounting, arcane accounting depreciation formulas, and accounting rules that forbid the recognition of valuable intangible assets, is known to be an unreliable (typically conservatively biased) estimate of net asset value.

  3. 3.

    The Internal Revenue Code addresses the valuation of closely held securities in Section 2031(b). The standard of value is “fair market value,” the price at which willing buyers or sellers with reasonable knowledge of the facts are willing to transact. Revenue Ruling 59–60 (1959–1 C.B. 237) sets forth the IRS’s interpretation of IRC Section 2031(b).

  4. 4.

    For example, a large block trade of micro-cap shares may cause temporary price volatility. Non-synchronous trading may cause apparent excessive price stability, as seen in emerging equity markets.

  5. 5.

    YNm, τ2 means Y is normally distributed with mean m and standard deviation τ. Note that we leave the possibility that the standard deviations may be heteroskedatic – nothing in our model requires them to be independent of V.

  6. 6.

    Accounting treatments like mark-to-market accounting or cookie-jar accounting may correlate accounting numbers to market noise. If so, then DCF estimates that rely on accounting numbers to make their cash flow projections may correlate to market noise, so that corr(e I , e)≠0. For this reason, the Appendix provides the generalization of Theorem 11.1 to the case when corr(e I , e) = ρ I ≠0.

  7. 7.

    Bell vs. Kirby Lumber Corp., Del. Supr., 413 A.2d 137 (1980).

  8. 8.

    For comparison, a random number homogeneously distributed between 0 and 1 has average value 50% and standard deviation 28.9%. Since the market value and earnings value weights have significantly smaller spread and their means differ from 50%, it does not appear these weights are homogeneously distributed random variables.

  9. 9.

    Most of my 15 series, including gold, began well after 1901. Only the cotton, corn, and wheat series started in January 1901.

  10. 10.

    While it is unrealistic to believe that investors can trade these commodities at the quoted historical cash prices, a parallel exercise (not reported here) using commodity futures prices would yield similar results.

  11. 11.

    Unfortunately, the theory of storage is still incomplete. As Deaton and Laroque (2003, p. 1) explain, the model, “although capable of introducing some autocorrelation into an otherwise i.i.d. process, appears to be incapable of generating the high degree of serial correlation of most commodity prices. We are therefore left without a coherent explanation for the high degree of autocorrelation in commodity prices

  12. 12.

    Yee (2008b) deconstructs the round-trip process of fundamental analysis, stock selection, and profit taking. Klarman (1991) presents a hearty practitioner’s account.

  13. 13.

    Yoo (2006) empirically examined, in a large-scale study of Compustat firms, whether taking a linear combination of several univariate method of comparables estimates would achieve more precise valuation estimates than any comparables estimate alone. He concluded that the forward price-earnings ratio essentially beats the trailing ratios, or combination of trailing ratios, so much that combining it with other benchmark estimates does not help. Yoo did not consider DCF, liquidation value, or market price in his study.

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Acknowledgments

The statements and opinions expressed in this article are those of the author as of the date of the article and do not necessarily represent the views of the Bank of New York Mellon, Mellon Capital Management, or any of their affiliates. This article does not offer investment advice.

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Correspondence to Kenton K. Yee .

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Yee, K.K. (2010). Combining Fundamental Measures for Stock Selection. In: Lee, CF., Lee, A.C., Lee, J. (eds) Handbook of Quantitative Finance and Risk Management. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-77117-5_11

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