Masterarbeit, 2011
32 Seiten, Note: 81 %
1. Introduction
2. Linear Predictive Regression Model
3. Econometric Methodology and Hypothesis of Interest
4. Empirical Results
5. Economic Interpretation
6. Conclusions
References
Appendix
Table I, II, III
Table IV, V, VI
Table VII, VIII
Table IX, X
Figure I
This dissertation examines the predictive power of dividend yields in forecasting future excess stock returns within a linear predictive regression framework, while explicitly addressing the issue of structural instability over time.
3 Econometric Methodology and Hypothesis of Interest
Lettau and Nieuwerburgh (2007) in their studies describe the incompatible outcomes of stock predictability shown in the recent literature. There have been various opinions, some supporting the claim that the stock returns may be partially forecastable with financial data, and others declaring the nonexistence of predictability. Certainly, findings were not identical because test measures, assumptions and methodologies presented in these paper were not unified and not all statistical problems were taken into account. For example, Fama and French (1988) report a high predictive ability of dividend-price ratio on the future stock returns, but they relied mainly on asymptotic theory. Hence, due to the inference problem that may appear as a result of structural instability it would be sensible to test the null hypothesis of linearity: H0: α1=α2, β1=β2 (3.1) against the general model presented in equations (2.4). Hence, the intuition is to test the structural stability of both, intercept and slope coefficient, in the linear predictive regression model (parameters α and β from equation (2.1)). The implication of the presence of a break is that it may alter the conditional expected stock return E(yt+1|xt). As a consequence, the predictive power of the lagged explanatory variable can be inappropriately estimated. If the null hypothesis cannot be rejected, this result could justify the methodology previously described in the literature by, exempli gratia, Campbell and Yogo (2006). What is more, in the case where the result suggests the constant mean specification, that is α1=α2=0 and β1=β2=0, the predictive power of the lagged independent variable used in the regression is said to be nonexistent. On the other hand, the evidence of the structural break would support the claim presented by Rapach and Wohar (2006). In order to verify which of the confronting claims may be correct, I proceed to testing for the structural instability of the coefficients.
1. Introduction: Outlines the concept of predictive regressions, identifies statistical challenges like persistence and endogeneity, and states the primary research goal of assessing predictive ability and stability.
2. Linear Predictive Regression Model: Defines the mathematical framework of the regression model and discusses the econometric issues arising from persistent variables and endogenous innovations.
3. Econometric Methodology and Hypothesis of Interest: Details the testing procedure for structural breaks, specifically discussing the Andrews (SupWald) test as a remedy for unknown break dates.
4. Empirical Results: Presents the findings of applying the model to US stock market data (1927-2007), testing for unit roots and evaluating coefficient stability across sub-periods.
5. Economic Interpretation: Provides context for the statistical findings by correlating identified potential break-points with major historical economic events and shifts in stock market dynamics.
6. Conclusions: Summarizes the dissertation's contributions, acknowledging the complexity of predictive regression models and the necessity of testing for structural instability.
Predictive regression, Dividend yields, Excess stock returns, Structural break, Andrews test, SupWald statistic, Parameter instability, Financial econometrics, Endogeneity, Persistence, Unit root, Forecasting, Market efficiency, Economic regime, Asset pricing.
This work explores whether dividend yields can predict excess stock returns and whether this predictive relationship remains stable over time or is subject to structural breaks.
The research sits at the intersection of financial econometrics and asset pricing, specifically focusing on the statistical validity of predictive models for stock returns.
The study asks if excess stock returns are predictable using dividend yields and if such predictability holds stable across different economic regimes.
The author employs a linear predictive regression framework and utilizes the Andrews (SupWald) test to detect potential structural instability in model coefficients.
The work covers the theoretical formulation of the predictive model, the identification of statistical pitfalls (like endogeneity), the empirical application to long-term financial data, and the economic interpretation of found instabilities.
Key terms include Predictive regression, Dividend yields, Structural break, SupWald statistic, and Asset pricing.
The Andrews test is used because the exact timing of potential structural breaks in the financial data is unknown, whereas the Chow test requires an a priori known break-point.
The author notes that statistical break-points, such as those found in 1932 and 1995, often coincide with significant historical market events like the Great Depression and the emergence of new technologies in the 90s.
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