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The impacts of investor sentiment on returns and conditional volatility of international stock markets

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Abstract

One of the main arguments of behavioral finance is that some properties of asset prices are most probably regarded as deviations from fundamental value and they are generated by the participation of traders who are not fully rational, thus called noise traders. Noise trader theory postulates that sentiment traders have greater impact during high-sentiment periods than during low-sentiment periods, and sentiment traders miscalculate the variance of returns undermining the mean-variance relation. The main objective of this research is to construct a model to evaluate the returns and conditional volatility of various stock market indexes considering the changes in the investor sentiment by measuring the effects of noise trader demand shocks on returns and volatility. EGARCH model is used to determine whether earning shocks have more influence on the conditional volatility in high sentiment periods weakening the mean–variance relation. This paper takes an international approach using weekly market index returns of U.S., Japan, Hong Kong, U.K., France, Germany, and Turkey. Weekly trading volumes of these indexes are regressed against a group of macroeconomic variables and the residuals are used as proxies for investor sentiment and significant evidence is found that there is asymmetric volatility in these market indexes and earning shocks have more influence on conditional volatility when the sentiment is high.

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Authors and Affiliations

  1. Istanbul Technical University, Faculty of Management, Department of Management Engineering, Istanbul, Turkey

    Utku Uygur & Oktay Taş

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  1. Utku Uygur
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  2. Oktay Taş
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Correspondence to Utku Uygur.

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Uygur, U., Taş, O. The impacts of investor sentiment on returns and conditional volatility of international stock markets. Qual Quant 48, 1165–1179 (2014). https://doi.org/10.1007/s11135-013-9827-3

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