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definition - treynor ratio

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Treynor ratio

                   

The Treynor ratio (sometimes called the reward-to-volatility ratio or Treynor measure[1]), named after Jack L. Treynor,[2] is a measurement of the returns earned in excess of that which could have been earned on an investment that has no diversifiable risk (e.g., Treasury Bills or a completely diversified portfolio), per each unit of market risk assumed.

The Treynor ratio relates excess return over the risk-free rate to the additional risk taken; however, systematic risk is used instead of total risk. The higher the Treynor ratio, the better the performance of the portfolio under analysis.

Contents

  Formula

T = \frac{r_i - r_f}{\beta_i}

where:

T \equiv Treynor ratio,
r_i \equiv portfolio i's return,
r_f \equiv risk free rate
\beta_i  \equiv portfolio i's beta

  Limitations

Like the Sharpe ratio, the Treynor ratio (T) does not quantify the value added, if any, of active portfolio management. It is a ranking criterion only. A ranking of portfolios based on the Treynor Ratio is only useful if the portfolios under consideration are sub-portfolios of a broader, fully diversified portfolio. If this is not the case, portfolios with identical systematic risk, but different total risk, will be rated the same. But the portfolio with a higher total risk is less diversified and therefore has a higher unsystematic risk which is not priced in the market.

An alternative method of ranking portfolio management is Jensen's alpha, which quantifies the added return as the excess return above the security market line in the capital asset pricing model. As these two methods both determine rankings based on systematic risk alone, they will rank portfolios identically.

  See also

  References

  1. ^ Brown, Keith C.; Frank K. Reilly. "25". Analysis of Investments and Management of Portfolios (9th International ed.). Cengage Learning. pp. 941. 
  2. ^ "Treynor Ratio". http://www.investopedia.com/terms/t/treynorratio.asp. Retrieved 20 February 2010. 


   
               

 

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