Abstract
This study investigates the impact of both social and news sentiments indices on the dynamic stock–bond correlation across wavelet-based time-scales over the period 1998–2016. Our results show that the news sentiments namely unemployment, tsunami and sanctions exhibit significant effects during expansion at the shortest time-scale of [2–4] days. These predictors remain significant with reverse signs during recession on the long investment horizon. Yet, the predictability of social media sentiments differs from that of news sentiments with the pattern of reversal in sign also presents for some proxies including windstorm and investment flows. Statistically, our further analysis confirmed the predictability of the sentiments out-of-sample. Excluding the news and social media sentiment effects has also resulted in minimizing the value-at-risk of the (40/60) stock/bond portfolios the most at the investment horizon of [32–64] days during recessions. Our results remain the same after performing some robustness checks.
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Notes
Nardo et al. (2016) reviews the literature exploring social media and its role in stock market predictability.
Down-sampling means reducing the sample size to the half at each time-scale. For example, 1000 observations on first time-scale will be 500 on the second time-sale, 250 on time-scale 3 and so forth.
The decomposition of the daily return series data ensures that the variance at short time-scale is more than that at the long-time scale. That helps in explaining the excess volatility in the short run periods resulting from the high uncertainty and the behaviour of short-term investors in the market.
Aloui et al. (2021) extracted the sentiment proxy from the American association of individual investors (AAII) database and performed their analysis using the continuous wavelet approach.
These sentiment indicators are defined in the Appendix A.1. We describe the process of construction our sentiments in Sect. 3.1.
The data are provided by Thomson Reuters Financial and Risk Team as part of TRMI product. TRMI covers a plethora of securities and markets, including more than 12,000 companies, 36 commodities and energy subjects, 187 countries, 62 sovereign markets, 45 currencies, and, since 2009, more than 150 cryptocurrencies. For more details, see Thomson Reuters MarketPsych Indices 2.2 User Guide, 25 May 2019, Document Version 1.0.
Also aiming at categorising sentiment measures, Ding et al. (2019) decomposed Baker et al. (2006)’s sentiment into short and long term components and examined their impacts on the cross section of stock returns.
We dropped out some news (social media) constructed PCs if they have high correlation with the other constructed news (social media) ones. The correlation coefficient of 70 per cent if considered cut off point to either consider or drop out the variables from the further analysis.
We also perform the log likelihood ratio test by comparing between the performance of the unrestricted (ADCC) and the restricted (DCC) model. The null hypothesis for the superiority of the DCC model is then rejected at the aggregate level and at all time-scales at 5% significance level. The critical value for the test is 3.84. The results from the test are available upon request.
While we also assume the standardised residuals are normally distributed, following Cappiello et al. (2006), we note that the choice of distribution is not statistically important in the estimation of the conditional variance equation.
To estimate our model, we made the order of lagged correlation equals zero.
The diagonal version assumes that equity-bond correlation can differ across different maturity bonds.
However, controlling for only one lag of the daily correlation can be hardly sufficient. To deal with this issue, we controlled for up to 5 lags (a trading week) and our results remain qualitatively and quantitatively similar. Also, based on the information criteria and the log likelihood, our specification is found to be adequate. We thank the reviewer for addressing this point. The results from this additional analysis are available upon request.
Other related studies also ran their regressions with one of the predictors being the lagged correlation (e.g. Christiansen and Ranaldo 2007 among others). However, we also estimated our model without the lagged correlation and the results remain statistically the same, but the adjusted R became low. These findings are available upon request.
Intercepts were included in the regression estimates but not reported to save the space.
Again, the variation in the significance level mirrors those observed in the news sentiments-based regressions, for the full explanation, refer to pages 33 and 34.
We also perform the rolling window exercise. See Appendix C.
The full VaR estimates on time-scales are available upon request. They are omitted to save the space.
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Appendices
Appendix A
See Table
11.
Appendix B
See Table
12.
Appendix C
Notes the figure below shows the rolling regression estimates from the equation:
The analysis is performed on the time-scales 1 and 5 with a window size of 1250 days and one step ahead in the future. Panel A (B) shows the estimates from the regression with the news (social media) predictors. The shaded areas indicate the NBER recession periods. For further information about full notation in the model, see Table 6 (Fig. 2).
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Alomari, M., Al rababa’a, A., El-Nader, G. et al. Who’s behind the wheel? The role of social and media news in driving the stock–bond correlation. Rev Quant Finan Acc 57, 959–1007 (2021). https://doi.org/10.1007/s11156-021-00967-4
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DOI: https://doi.org/10.1007/s11156-021-00967-4