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Portfolio Performance Evaluation: Measuring Risk and Return

Learn the importance of measuring portfolio risk and traditional performance measures, as well as performance evaluation with cash deposits, withdrawals, and options.

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Portfolio Performance Evaluation: Measuring Risk and Return

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  1. Chapter 19Performance Evaluation

  2. And with that they clapped him into irons and hauled him off to the barracks. There he was taught “right turn,” “left turn,” and “quick march,” “slope arms,” and “order arms,” how to aim and how to fire, and was given thirty strokes of the “cat.” Next day his performance on parade was a little better, and he was given only twenty strokes. The following day he received a mere ten and was thought a prodigy by his comrades. - From Candide by Voltaire

  3. Outline • Introduction • Importance of measuring portfolio risk • Traditional performance measures • Performance evaluation with cash deposits and withdrawals • Performance evaluation when options are used

  4. Introduction • Performance evaluation is a critical aspect of portfolio management • Proper performance evaluation should involve a recognition of both the return and the riskiness of the investment

  5. Importance of Measuring Portfolio Risk • Introduction • A lesson from history: the 1968 Bank Administration Institute report • A lesson from a few mutual funds • Why the arithmetic mean is often misleading: a review • Why dollars are more important than percentages

  6. Introduction • When two investments’ returns are compared, their relative risk must also be considered • People maximize expected utility: • A positive function of expected return • A negative function of the return variance

  7. A Lesson from History • The 1968 Bank Administration Institute’s Measuring the Investment Performance of Pension Funds concluded: • Performance of a fund should be measured by computing the actual rates of return on a fund’s assets • These rates of return should be based on the market value of the fund’s assets

  8. A Lesson from History (cont’d) • Complete evaluation of the manager’s performance must include examining a measure of the degree of risk taken in the fund • Circumstances under which fund managers must operate vary so great that indiscriminate comparisons among funds might reflect differences in these circumstances rather than in the ability of managers

  9. A Lesson from A Few Mutual Funds • The two key points with performance evaluation: • The arithmetic mean is not a useful statistic in evaluating growth • Dollars are more important than percentages • Consider the historical returns of two mutual funds on the following slide

  10. A Lesson from A Few Mutual Funds (cont’d)

  11. A Lesson from A Few Mutual Funds (cont’d)

  12. A Lesson from A Few Mutual Funds (cont’d) • 44 Wall Street and Mutual Shares both had good returns over the 1975 to 1988 period • Mutual Shares clearly outperforms 44 Wall Street in terms of dollar returns at the end of 1988

  13. Why the Arithmetic Mean Is Often Misleading • The arithmetic mean may give misleading information • E.g., a 50% decline in one period followed by a 50% increase in the next period does not return 0%, on average

  14. Why the Arithmetic Mean Is Often Misleading (cont’d) • The proper measure of average investment return over time is the geometric mean:

  15. Why the Arithmetic Mean Is Often Misleading (cont’d) • The geometric means in the preceding example are: • 44 Wall Street: 7.9% • Mutual Shares: 22.7% • The geometric mean correctly identifies Mutual Shares as the better investment over the 1975 to 1988 period

  16. Why the Arithmetic Mean Is Often Misleading (cont’d) Example A stock returns –40% in the first period, +50% in the second period, and 0% in the third period. What is the geometric mean over the three periods?

  17. Why the Arithmetic Mean Is Often Misleading (cont’d) Example Solution: The geometric mean is computed as follows:

  18. Why Dollars Are More Important than Percentages • Assume two funds: • Fund A has $40 million in investments and earned 12% last period • Fund B has $250,000 in investments and earned 44% last period

  19. Why Dollars Are More Important than Percentages • The correct way to determine the return of both funds combined is to weigh the funds’ returns by the dollar amounts:

  20. Traditional Performance Measures • Sharpe and Treynor measures • Jensen measure • Performance measurement in practice

  21. Sharpe and Treynor Measures • The Sharpe and Treynor measures:

  22. Sharpe and Treynor Measures (cont’d) • The Treynor measure evaluates the return relative to beta, a measure of systematic risk • It ignores any unsystematic risk • The Sharpe measure evaluates return relative to total risk • Appropriate for a well-diversified portfolio, but not for individual securities

  23. Sharpe and Treynor Measures (cont’d) Example Over the last four months, XYZ Stock had excess returns of 1.86%, -5.09%, -1.99%, and 1.72%. The standard deviation of XYZ stock returns is 3.07%. XYZ Stock has a beta of 1.20. What are the Sharpe and Treynor measures for XYZ Stock?

  24. Sharpe and Treynor Measures (cont’d) Example (cont’d) Solution: First compute the average excess return for Stock XYZ:

  25. Sharpe and Treynor Measures (cont’d) Example (cont’d) Solution (cont’d): Next, compute the Sharpe and Treynor measures:

  26. Jensen Measure • The Jensen measure stems directly from the CAPM:

  27. Jensen Measure (cont’d) • The constant term should be zero • Securities with a beta of zero should have an excess return of zero according to finance theory • According to the Jensen measure, if a portfolio manager is better-than-average, the alpha of the portfolio will be positive

  28. Jensen Measure (cont’d) • The Jensen measure is generally out of favor because of statistical and theoretical problems

  29. Performance Measurement in Practice • Academic issues • Industry issues

  30. Academic Issues • The use of traditional performance measures relies on the CAPM • Evidence continues to accumulate that may ultimately displace the CAPM • APT, multi-factor CAPMs, inflation-adjusted CAPM

  31. Industry Issues • “Portfolio managers are hired and fired largely on the basis of realized investment returns with little regard to risk taken in achieving the returns” • Practical performance measures typically involve a comparison of the fund’s performance with that of a benchmark

  32. Industry Issues (cont’d) • Fama’s decomposition can be used to assess why an investment performed better or worse than expected: • The return the investor chose to take • The added return the manager chose to seek • The return from the manager’s good selection of securities

  33. Performance Evaluation With Cash Deposits & Withdrawals • Introduction • Daily valuation method • Modified Bank Administration Institute (BAI) Method • An example • An approximate method

  34. Introduction • The owner of a fund often taken periodic distributions from the portfolio and may occasionally add to it • The established way to calculate portfolio performance in this situation is via a time-weighted rate of return: • Daily valuation method • Modified BAI method

  35. Daily Valuation Method • The daily valuation method: • Calculates the exact time-weighted rate of return • Is cumbersome because it requires determining a value for the portfolio each time any cash flow occurs • Might be interest, dividends, or additions and withdrawals

  36. Daily Valuation Method (cont’d) • The daily valuation method solves for R:

  37. Daily Valuation Method (cont’d) • MVEi = market value of the portfolio at the end of period i before any cash flows in period i but including accrued income for the period • MVBi = market value of the portfolio at the beginning of period i including any cash flows at the end of the previous subperiod and including accrued income

  38. Modified BAI Method • The modified BAI method: • Approximates the internal rate of return for the investment over the period in question • Can be complicated with a large portfolio that might conceivably have a cash flow every day

  39. Modified BAI Method (cont’d) • It solves for R:

  40. An Example • An investor has an account with a mutual fund and “dollar cost averages” by putting $100 per month into the fund • The following slide shows the activity and results over a seven-month period

  41. An Example (cont’d) • The daily valuation method returns a time-weighted return of 40.6% over the seven-months period • See next slide

  42. An Example (cont’d) • The BAI method requires use of a computer • The BAI method returns a time-weighted return of 42.1% over the seven-months period (see next slide)

  43. An Approximate Method • Proposed by the American Association of Individual Investors:

  44. An Approximate Method (cont’d) • Using the approximate method in Table 19-6:

  45. Performance Evaluation When Options Are Used • Introduction • Incremental risk-adjusted return from options • Residual option spread • Final comments on performance evaluation with options

  46. Introduction • Inclusion of options in a portfolio usually results in a non-normal return distribution • Beta and standard deviation lose their theoretical value of the return distribution is nonsymmetrical

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