Abstract
Growing literature documents that jump variations are important for comprehending the evolution of asset prices. In this paper, we provide a novel insight on the jump components. Specifically, we forecast the equity premium using the weighted least squares (WLS) approach that assigns the inverse of variance weight to observations, and detect the role of jump contributions in it. The results indicate that the WLS models with jump-robust variance weights generate superior out-of-sample performance both statistically and economically relative to that with the jump-involved weights, suggesting that eliminating the jump variation in the variance weight helps to predict the stock returns. The predictive source of the jump-robust variance stems from its efficient measure of the continuous price process and forecast error variance reduced. Furthermore, we demonstrate that the jump component in the variance weight should rather be dumped than collected in terms of minimizing the forecast losses.
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Notes
According to Barndorff-Nielsen and Shephard (2004a, b) and Andersen et al. (2012), \(d_{m,q} = u_{q/m}^{ - m}\), where \(u_{p} = 2^{\frac{p}{2}} \frac{{\Gamma \left( {{{\left( {p + 1} \right)} \mathord{\left/ {\vphantom {{\left( {p + 1} \right)} 2}} \right. \kern-0pt} 2}} \right)}}{{\Gamma \left( {{1 \mathord{\left/ {\vphantom {1 2}} \right. \kern-0pt} 2}} \right)}}\). We also can obtain BPV = MPV(2;2).
Additionally, using daily data enables us to forecast the excess return over a long sample because the intraday data availability is limited.
The alternate combination methods are also employed for examining the robustness.
The homepage of Amit Goyal is at https://sites.google.com/view/agoyal145/.
For briefness, we only report the forecasting results of the mean combination for each model because the combination approach is a more reliable and efficient strategy to be applied in practice.
The construction of the quarterly macroeconomic variables is similar to that of the monthly ones, the data of which is also available at the homepage of Amit Goyal.
We thank the anonymous referee for this valuable suggestion.
When comparing different WLS-JRV models with the WLS-RV, we use the corresponding JRV estimator to detect the jump diffusion. More specifically, we calculate jump component using BPV, TPV, and QPV when evaluating the performance of WLS-BPV, WLS-TPV, and WLS-QPV, respectively.
The results are similar when using the R2OS values and CW tests to investigate the conditional forecasting performance.
For the jump detection based on BPV, TPV, and QPV, the discrete jumps occur 376, 446, and 456 times, respectively, in the out-of-sample periods within 900 observations in total.
In this subsection, we report the results for the jump detection based on BPV, and those based on other jump-robust variances like TPV and QPV are robust.
We follow Yu et al. (2021) to set the validation sample as long as 12 months. The results are robust when changing it to 24 months. For the sake of brevity, we do not again report these similar results for alternate specifications.
The results for using different window lengths to produce volatility forecasts are quantitatively similar, therefore, these results are not reported to save space.
The results for individual predictors under alternative conditions are not reported, but they are available upon request.
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Acknowledgements
This work is supported by the National Natural Science Foundation of China [72001110; 72371131; 72071114].
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Zhang, Z., Zhang, Y. & Wang, Y. Forecasting the equity premium using weighted regressions: Does the jump variation help?. Empir Econ 66, 2049–2082 (2024). https://doi.org/10.1007/s00181-023-02521-8
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DOI: https://doi.org/10.1007/s00181-023-02521-8