McGraw-Hill/Irwin Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved. Chapter 13 Empirical Evidence on Security Returns.

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Presentation transcript:

McGraw-Hill/Irwin Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved. Chapter 13 Empirical Evidence on Security Returns

13-2 Overview of Investigation Tests of the single factor CAPM or APT Model Tests of the Multifactor APT Model Results are difficult to interpret Studies on volatility of returns over time

13-3 Tests of the Single Factor Model Tests of the expected return beta relationship: First Pass Regression Estimate beta, average risk premiums and unsystematic risk. Second Pass: Using estimates from the first pass to determine if model is supported by the data. Most tests do not generally support the single factor model.

13-4 Single Factor Test Results Return % Beta Predicted Actual

13-5 Roll’s Criticism The only testable hypothesis is on the efficiency of the market portfolio. Benchmark error

13-6 Measurement Error in Beta Statistical property If beta is measured with error in the first stage, second stage results will be biased in the direction the tests have supported. Test results could result from measurement error.

13-7 Jaganathan and Wang Study Included factors for cyclical behavior of betas and human capital. When these factors were included the results showed returns were a function of beta. Size is not an important factor when cyclical behavior and human capital are included.

13-8 Tests of the Multifactor Model Chen, Roll and Ross 1986 Study Factors Growth rate in industrial production Changes in expected inflation Unexpected inflation Changes in risk premiums on bonds Unexpected changes in term premium on bonds

13-9 Study Structure & Results Method: Two -stage regression with portfolios constructed by size based on market value of equity. Findings Significant factors: industrial production, risk premium on bonds and unanticipated inflation. Market index returns were not statistically significant in the multifactor model.

13-10 Anomalies Literature Is the CAPM or APT Model Valid? Numerous studies show the approach is not valid. Why do the studies show this result? Other factors influence returns on securities. Statistical problems prohibit a good test of the model.

13-11 Fama-French Three Factor Model Size and book-to-market ratios explain returns on securities Smaller firms experience higher returns High book to market firms experience higher returns Returns are explained by size, book to market and by beta

13-12 Interpretations of Fama-French Models Size and book to market are factors that describe returns – results are consistent with APT Results may indicate irrational preferences for large size and low book to market firms More study needed

13-13 Time-Varying Volatility Stock prices change primarily in reaction to information. New information arrival is time varying. Volatility is therefore not constant through time.

13-14 Stock Volatility Studies and Techniques Volatility is not constant through time. Improved modeling techniques should improve results of tests of the risk-return relationship. ARCH and GARCH models incorporate time varying volatility.

13-15 Equity Premium Puzzle Rewards for bearing risk appear to excessive. Possible Causes Unanticipated capital gains Survivorship bias Survivorship bias also creates the appearance of abnormal returns in market efficiency studies.