© k. cuthbertson and d. nitzsche chapter 29 performance of mutual funds investments
TRANSCRIPT
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© K. Cuthbertson and D. Nitzsche
Chapter 29
Performance of Mutual Funds
Investments
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Learning Objectives
© K. Cuthbertson and D. Nitzsche
To explain how we assess risk-adjusted performance of mutual funds using funds alpha
To examine the historic performance of mutual funds
To examine whether it is possible to pick groups of funds that earn positive abnormal return in the future
To examine whether investors put money in into funds that do well and withdraw from funds that do perform badly
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A Lesson from a Few Mutual Funds
3
The two key points with performance evaluation: The arithmetic mean is not a useful statistic in
evaluatingConsider the historical returns of two mutual
funds on the following slide
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A Lesson from a Few Mutual Funds (cont’d)
23.5%
30.7
6.5
16.9
26.3
14.3
37.8
12.0
Mutual Shares
19.3%
19.3
–34.6
–16.3
–20.1
–58.7
9.2
6.9
44 Wall Street
Mean
1988
1987
1986
1985
1984
1983
1982
Year
8.7-23.61981
19.036.11980
39.371.41979
16.132.91978
13.216.51977
63.146.51976
24.6%184.1%1975
Mutual Shares
44 Wall StreetYea
r
Change in net asset value, January 1 through December 31.
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A Lesson from a Few Mutual Funds (cont’d)
Mutual Fund Performance
$-$20,000.00$40,000.00$60,000.00$80,000.00
$100,000.00$120,000.00$140,000.00$160,000.00$180,000.00$200,000.00
Year
En
din
g V
alu
e (
$)
44 WallStreet
MutualShares
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6
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
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Why the Arithmetic Mean Is Often Misleading: A Review
The arithmetic mean may give misleading information e.g., a 50 percent decline in one period followed by a
50 percent increase in the next period does not produce an average return of zero
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Why the Arithmetic Mean Is Often Misleading: A Review (cont’d)
The proper measure of average investment return over time is the geometric mean:
1/
1
1
where the return relative in period
nn
ii
i
GM R
R i
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Traditional Performance Measures
Sharpe MeasureTreynor MeasuresJensen MeasurePerformance Measurement in Practice
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Sharpe and Treynor Measures
The Sharpe and Treynor measures:
Sharpe measure
Treynor measure
where average return
risk-free rate
standard deviation of returns
beta
f
f
f
R R
R R
R
R
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Sharpe and Treynor Measures (cont’d)
Example
Over the last four months, XYZ Stock had excess returns of 1.86 percent, –5.09 percent, –1.99 percent, and 1.72 percent. The standard deviation of XYZ stock returns is 3.07 percent. XYZ Stock has a beta of 1.20.
What are the Sharpe and Treynor measures for XYZ Stock?
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Sharpe and Treynor Measures (cont’d)
Example (cont’d)
Solution: First, compute the average excess return for Stock XYZ:
1.86% 5.09% 1.99% 1.72%
40.88%
R
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Sharpe and Treynor Measures (cont’d)
Example (cont’d)
Solution (cont’d): Next, compute the Sharpe and Treynor measures:
0.88%Sharpe measure 0.29
3.07%
0.88%Treynor measure 0.73
1.20
f
f
R R
R R
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Portfolio Performance Measures:Treynor’s versus Sharpe’s Measure
Treynor versus Sharpe Measure Sharpe uses standard deviation of returns as the
measure of risk Treynor measure uses beta (systematic risk) Sharpe evaluates the portfolio manager on basis of
both rate of return performance and diversification Methods agree on rankings of completely diversified
portfolios Produce relative not absolute rankings of performance
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Jensen Measure
The Jensen measure stems directly from the CAPM:
it ft i mt ftR R R R
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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
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Academic Issues Regarding Performance
Measures
The use of Treynor and Jensen performance measures relies on measuring the market return and CAPM Difficult to identify and measure the return of the
market portfolioEvidence continues to accumulate that may
ultimately displace the CAPM Arbitrage pricing model, multi-factor CAPMs,
inflation-adjusted CAPM
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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
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Industry Issues (cont’d)
“Fama’s return 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
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Industry Issues (cont’d)
Diversification is the difference between the return corresponding to the beta implied by the total risk of the portfolio and the return corresponding to its actual beta Diversifiable risk decreases as portfolio size increases,
so if the portfolio is well diversified the “diversification return” should be near zero
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Industry Issues (cont’d)
Net selectivity measures the portion of the return from selectivity in excess of that provided by the “diversification” component