IDEAS home Printed from https://ideas.repec.org/p/ebg/iesewp/d-0685.html
   My bibliography  Save this paper

El peligro de utilizar betas calculadas

Author

Listed:
  • Fernandez, Pablo

    (IESE Business School)

  • Carabias, Jose M.

    (IESE Business School)

Abstract

En este artículo se muestra que es un error enorme utilizar las betas calculadas con datos históricos para calcular la rentabilidad exigida a las acciones o para medir la gestión de una cartera de valores. Por 7 razones: porque cambian mucho de un día para otro; porque dependen de qué índice bursátil se tome como referencia. porque dependen mucho de qué periodo histórico (5 años, 3 años,…) y de qué rentabilidades (mensuales, anuales,…) se utilicen para su cálculo; porque con mucha frecuencia no sabemos si la beta de una empresa es superior o inferior a la beta de otra empresa; porque tienen muy poca relación con la rentabilidad posterior de las acciones; y porque la correlación (y la R2) de las regresiones que se utilizan para su cálculo son muy pequeñas. Debido a estas 7 razones podemos afirmar que o bien la beta calculada con datos históricos no es una buena aproximación al riesgo de la empresa, o bien el CAPM no funciona (hay más factores que afectan a su rentabilidad exigida, además de la covarianza de la rentabilidad de una empresa con la rentabilidad del mercado, la tasa sin riesgo y la prima de riesgo del mercado), o bien, ambas cosas a la vez.

Suggested Citation

  • Fernandez, Pablo & Carabias, Jose M., 2007. "El peligro de utilizar betas calculadas," IESE Research Papers D/685, IESE Business School.
    • Handle: RePEc:ebg:iesewp:d-0685
    as

    Download full text from publisher

    File URL: http://www.iese.edu/research/pdfs/DI-0685.pdf
    Download Restriction: no
    ---><---

    More about this item

    Keywords

    beta; rentabilidad exigida a las acciones; rentabilidad para los accionistas;
    All these keywords.

    JEL classification:

    • G12 - Financial Economics - - General Financial Markets - - - Asset Pricing; Trading Volume; Bond Interest Rates
    • G31 - Financial Economics - - Corporate Finance and Governance - - - Capital Budgeting; Fixed Investment and Inventory Studies
    • M21 - Business Administration and Business Economics; Marketing; Accounting; Personnel Economics - - Business Economics - - - Business Economics

    NEP fields

    This paper has been announced in the following NEP Reports:

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:ebg:iesewp:d-0685. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Noelia Romero (email available below). General contact details of provider: https://edirc.repec.org/data/ienaves.html .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.