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PRMIA Exam 8006 Topic 10 Question 1 Discussion

Actual exam question for PRMIA's Exam I: Finance Theory, Financial Instruments, Financial Markets ? 2015 Edition exam
Question #: 1
Topic #: 10
[All Exam I: Finance Theory, Financial Instruments, Financial Markets ? 2015 Edition Questions]

Which of the following expressions represents the Treynor ratio, where is the expected return, is the standard deviation of returns, rm is the return of the market portfolio and rf is the risk free rate:





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Suggested Answer: A

The Sharpe ratio is the ratio of the excess returns of a portfolio to its volatility. It provides an intuitive measure of a portfolio's excess return over the risk free rate. The Sharpe ratio is calculated as [(Portfolio return - Risk free return)/Portfolio standard deviation].

The Treynor ratio is similar to the Sharpe ratio, but instead of using volatility in the denominator, it uses the portfolio's beta. Therefore the Treynor Ratio is calculated as [(Portfolio return - Risk free return)/Portfolio's beta]. Therefore Choice 'a' is the correct answer.

Jensen's alpha is another risk adjusted performance measure. It considers only the 'alpha', or the return attributable to a portfolio manager's skill. It is the difference between the return of the portfolio, and what the portfolio should theoretically have earned. Any portfolio can be expected to earn the risk free rate (rf), plus the market risk premium (which is given by [Beta x (Market portfolio's return - Risk free rate)]. Jensen's alpha is therefore the actual return earned less the risk free rate and the beta return.

Refer to the tutorial on risk adjusted performance measures for more details

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