English, Article, Journal or magazine article edition: The Valuation of Security Analysis Alex Kane; Alan J. Marcus

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Bookmark: http://trove.nla.gov.au/version/140404
Physical Description
  • preprint
Language
  • English

Edition details

Title
  • The Valuation of Security Analysis
Author
  • Alex Kane
  • Alan J. Marcus
Physical Description
  • preprint
Notes
  • Active portfolio management is commonly partitioned into two types of activities: market timing, which requires forecasts of broad-based market movements, and security analysis, which requires the selection of individual stocks that are perceived to be underpriced by the market. Merton (1981) has provided an inciteful and easily-implemented means to place a value on market timing skills. In contrast, while a normative theory of stock selection was outlined long ago in Treynor and Black's (1973) work, no convenient means of valuing potential selection ability has yet been devised. We present a framework in which the value of a security analyst can be computed. We also treat market timing ability in this framework, and therefore can compare the relative values of each type of investment analysts. We find that stock selection is potentially extremely valuable, but that its value depends critically on the forecast interval, on the correlation structure of residual stock returns, and on the ability to engage in short sales. Finally, we show how to modify the value of selection for the important case in which analysts' forecasts of stocks' alphas are subject to error.
  • RePEc:nbr:nberwo:1958
Language
  • English
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