| Summary: | 碩士 === 國立暨南國際大學 === 資訊管理學系 === 100 === With different risk measurement, the portfolio selection models including the Mean Variance model, the Mean Absolute Deviation model, the Downside Risk model, and Conditional Value at Risk model have been studied. Using the rolling window technique, multi-period trading simulation is performed while short selling is also taken into account for these four models. Three kinds of performance assessments which are market value, expect return, and standard deviation are used to compare the performances among these four models. The Conditional Value at Risk model exhibits superior performance no matter whether we take the factor of short selling into account or not. According to the four models which are taken the factor of short selling into account, we observe that with the increased importance of the objective of short selling, it’s able not only to reduce the volatility of the portfolio risk but also increase the market value. Therefore, according to this study, we can infer that conditional value at risk measure of portfolio rebalancing model can exhibit superior performance in simulating the historical data of stocks which consists in Taiwan 50 index.
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