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This paper examines optimal portfolio selection using quantile-based risk measures such as Valueat-Risk (VaR) and Conditional Value-at-Risk (CVaR). We address the case of a singular covariance matrix of asset returns, which leads to an optimization problem with infinitely many solutions. An...
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This study quantifies the dynamic interrelationship between the KOSPI index return and search query data derived from the Naver DataLab. The empirical estimation using a bivariate GARCH model reveals that negative contemporaneous correlations between the stock return and the search frequency...
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regression on wavelet coefficients. The concept of wavelet local multiple correlation is used to produce one single set of multi …-scale correlations along time, in contrast with the large number of wavelet correlation maps that need to be compared when using standard … century. It is shown how the evolution of the correlation structure in these markets has been far from homogeneous both along …
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