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  • 學位論文

台灣股價波動性與市場機制變數之關聯性研究- 以台灣五十成分股為例

An Empirical Study on the Relationship between Market Mechanism Variables and Stock Return Volatility- Evidence in The Underlying Stocks of Taiwan 50 ETFs

指導教授 : 倪衍森

摘要


大多數有關信用交易與外資的研究皆以兩者對股價指數的影響為主,本研究將嘗試以不同的方法與角度切入,以多為散戶所使用的信用交易指標來代表散戶;以外資持股來代表法人,探討散戶、外資法人之行為對於個股股價報酬率與股價報酬波動性是否有其資訊上的意涵。 本研究對象以2003至2006年期間,曾經納入台灣證券交易所所發行台灣五十指數成分股的公司,共63家公司作為分析對象,樣本期間為2003年1月起到2005年12月底止,三年的資料作為樣本事件的期間來進行實證研究,其重要發現如下: ㄧ、對於融資、融券程度對於五十成份股之影響,發現散戶的融券使用率增加會造成成分股的股價平均報酬率的增加,而在股價波動性方面,融資平均使用率的增加會造成成股股價報酬波動性的增加。 二、公司規模愈小,其五十成份股股票報酬波動性愈大,代表當公司規模較小的公司容易受到大環境的景氣所影響,導致其股價報酬波動幅度較大。 三、台灣五十成分股之電子類股股票報酬波動性高於非電子類股,表示不論是外資法人或者是散戶投資人都偏好電子類股,造成電子類股之股票報酬波動性會高於其他類股之表現。 四、外資對於大盤報酬之GARCH波動性與大盤報酬之波動性的影響,當外資的買賣金額佔成交金額越小時,表示當外資會偏向處於觀望的角度,通常大盤正處於波動幅度較大的狀態。

並列摘要


This study uses a sample of underlying stocks of Taiwan 50 ETFs over the period 2003-2005. The main purposes are to explore the relationship between market mechanism Variables and stock return volatility. Some statistical methods are used including multinomial regression, stepwise regression analysis and panel data model. The following conclusions are obtained in this study: 1. To influence of margin buying ratio and short selling ratio, the short selling ratio is larger, the stock return is also increasing. The margin buying ratio is larger, the return volatility of a stock is increasing at the same time. 2. The firm size is smaller, the return volatility of a stock is larger. It shows that the firm which size is small easily affected. 3. The return volatility of electronic stocks is larger than the return volatility of non- electronic stocks. It shows that not only foreign investors but also individual investors prefer electronic stocks. 4. To the influence of GARCH volatility and Market volatility, if QFII net buys-sells dollar volume is decreasing, market is in the fluctuated situation.

參考文獻


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