Performance Evaluation and Active Portfolio Management

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Presentation transcript:

Performance Evaluation and Active Portfolio Management CHAPTER 18 Performance Evaluation and Active Portfolio Management

Introduction Complicated subject Theoretically correct measures are difficult to construct Different statistics or measures are appropriate for different types of investment decisions or portfolios Many industry and academic measures are different The nature of active managements leads to measurement problems

Abnormal Performance What is abnormal? Abnormal performance is measured: Comparison groups Market adjusted Market model / index model adjusted Reward to risk measures such as the Sharpe Measure: E (rp-rf) / sp

Factors That Lead to Abnormal Performance Market timing Superior selection Sectors or industries Individual companies

Comparison Groups Simplest method Most popular Compare returns to other funds with similar investment objectives

Risk Adjusted Performance: Sharpe 1) Sharpe Index rp - rf p s rp = Average return on the portfolio rf = Average risk free rate p = Standard deviation of portfolio return s

Risk Adjusted Performance: Treynor 2) Treynor Measure rp - rf ßp rp = Average return on the portfolio rf = Average risk free rate ßp = Weighted average b for portfolio

Risk Adjusted Performance: Jensen 3) Jensen’s Measure = rp - [ rf + ßp ( rm - rf) ] a p = Alpha for the portfolio a p rp = Average return on the portfolio ßp = Weighted average Beta rf = Average risk free rate rm = Avg. return on market index port.

M2 Measure Developed by Modigliani and Modigliani Equates the volatility of the managed portfolio with the market by creating a hypothetical portfolio made up of T-bills and the managed portfolio If the risk is lower than the market, leverage is used and the hypothetical portfolio is compared to the market

M2 Measure: Example Managed Portfolio Market T-bill Return 35% 28% 6% Stan. Dev 42% 30% 0% Hypothetical Portfolio: Same Risk as Market 30/42 = .714 in P (1-.714) or .286 in T-bills (.714) (.35) + (.286) (.06) = 26.7% Since this return is less than the market, the managed portfolio underperformed

Figure 17-2 The M2 of Portfolio P

T2 (Treynor Square) Measure Used to convert the Treynor Measure into percentage return basis Makes it easier to interpret and compare Equates the beta of the managed portfolio with the market’s beta of 1 by creating a hypothetical portfolio made up of T-bills and the managed portfolio If the beta is lower than one, leverage is used and the hypothetical portfolio is compared to the market

T2 Example Port. P. Market Risk Prem. (r-rf) 13% 10% Beta 0.80 1.0 Alpha 5% 0% Treynor Measure 16.25 10 Weight to match Market w = bM/bP = 1.0 / 0.8 Adjusted Return RP* = w (RP) = 16.25% T2P = RP* - RM = 16.25% - 10% = 6.25%

Figure 17-3 Treynor Square Measure

Which Measure is Appropriate? It depends on investment assumptions 1) If the portfolio represents the entire investment for an individual, Sharpe Index compared to the Sharpe Index for the market. 2) If many alternatives are possible, use the Jensen a or the Treynor measure The Treynor measure is more complete because it adjusts for risk

Exercise2 1. A managed portfolio has a standard deviation equal to 22% and a beta of 0.9 when the market portfolio's standard deviation is 26%. The adjusted portfolio P* needed to calculate the M2 measure will have _____ invested in the managed portfolio and the rest in T-bills.  a. 84.6% b. 118% c. 18% d. 15.4%

Exercise 2  Use the following to answer questions 2-4: The average returns, standard deviations and betas for three funds are given in previous slide along with data for the S&P 500 index. The risk free return during the sample period is 6%.     2. You wish to evaluate the three mutual funds using the Sharpe measure for performance evaluation. The fund with the highest Sharpe measure of performance is __________.  a. Fund A b. Fund B c. Fund C d. Indeterminable    3. You wish to evaluate the three mutual funds using the Treynor measure for performance evaluation. The fund with the highest Treynor measure of performance is __________.  a. Fund A b. Fund B c. Fund C d. Indeterminable 4. You wish to evaluate the three mutual funds using the Jensen measure for performance evaluation. The fund with the highest Jensen measure of performance is __________.  a. Fund A b. Fund B c. Fund C d. S&P500

Limitations Assumptions underlying measures limit their usefulness When the portfolio is being actively managed, basic stability requirements are not met Practitioners often use benchmark portfolio comparisons to measure performance

Performance Attribution Decomposing overall performance into components Components are related to specific elements of performance Example components Broad Allocation Industry Security Choice Up and Down Markets

Market Timing Adjust the portfolio for movements in the market Shift between stocks and money market instruments or bonds Results: higher returns, lower risk (downside is eliminated) With perfect ability to forecast behaves like an option 3

Rate of Return of a Perfect Market Timer What if the forecast is not precise? rM rf 4

Market Timing & Performance Measurement Adjusting portfolio for up and down movements in the market Low Market Return - low ßeta High Market Return - high ßeta

Figure 17-6 Characteristic Lines

Style Analysis Introduced by Bill Sharpe Explaining percentage returns by allocation to style Style Analysis has become popular with the industry

Superior Selection Ability Concentrate funds in undervalued stocks or undervalued sectors or industries Balance funds in an active portfolio and in a passive portfolio Active selection will mean some unsystematic risk 8