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研究生:沈怡
研究生(外文):Shen, Sherry
論文名稱:滬深300指數成分股調整效應研究
論文名稱(外文):The Price Effect Associated with Changes in the CSI 300 List
指導教授:陳威光陳威光引用關係林靖庭林靖庭引用關係
指導教授(外文):Chen, Wei KuangLin, Ching Ting
學位類別:碩士
校院名稱:國立政治大學
系所名稱:金融研究所
學門:商業及管理學門
學類:財務金融學類
論文種類:學術論文
畢業學年度:102
語文別:中文
論文頁數:50
中文關鍵詞:指數調整效應滬深300指數長期
外文關鍵詞:CSI300
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指數成分股調整效應是行為財務領域的一大研究課題。近年來隨著中國股市不斷發展,各類指數衍生品層出不窮,指數的編制和調整也就產生越來越大的影響。另一方面,中國股市仍屬於新興市場,指數成分股調整的效應相較國外發達市場也許存在其特殊之處。而面對這一重要課題,中國學界和業界的研究卻略顯不足。鑒於此,本文從短期和長期兩個角度來研究對中國股市影響最大的指數——滬深300指數的成分股調整效應。
在滬深300指數成分股調整的短期效應方面,本文從股價和成交量兩個方面進行了研究。實證結果顯示,在股票剛被調入指數後,股價會產生正的異常報酬且成交量上升,而被調出指數的股票成交量會略微上升且產生負的異常報酬。但是與國外的實證結果相比,滬深300指數成分股調整的短期效應並沒有非常明顯,本文認為這可能與中國股市機構投資人占比過少有關。
在指數成分股調整對調入股和調出股的長期影響方面,本文首先研究了指數調整後的長期股價表現,發現調入股的股價累積報酬優於指數,但不如調入指數前自身的股價表現,調出股則與之相反。接著對股東人數、機構投資人數量和股價波動度進行比較分析。研究發現,指數調整之後,調入股的股東人數會顯著上升,調出股的股東會減少,但該因素對指數調整後股票的長期異常報酬沒有明顯影響;指數成分股調整後機構投資人數量和股價波動度也有明顯變化——調入股的機構投資人增加,波動度降低,調出股機構投資人減少,波動度上升——且這兩個因素對股價異常報酬的影響是顯著的。另外,公司規模大小也是影響股價異常報酬的一個顯著因素。

The effect of stock index composition changes is one of the important subjects in the field of behavioral finance. With the rapid development of Chinese equity market, stock index is playing an increasingly important part. Chinese equity market, on the other hand, is still at emerging stage, the stock index composition changes may have the different effect from that of the developed countries. However,the correlative study in China is far from enough. This paper investigates the CSI 300 which is the most influential stock index in China to find out the the effect of stock index composition changes in both short term and long term.
In the short term, the study focuses on the price and volume. The empirical results show that there is a positive abnormal returns and increasing trading volume of added firms, while a negative abnormal returns and slightly increasing trading volume of deleted firms. However, compared with empirical results abroad, short-term effects associated with the change of the CSI 300 index list is not very obvious, which may be accounted for too little institutional investors in the Chinese stock market.
In the long term, this paper firstly studies the long-term stock price performance of the index adjustment. For additions, cumulative return after index adjustment is better than that of the CSI 300 index, but is worse than the performance before the adjustment, while the deletions performance is opposite. Secondly, number of shareholders, institutional investors and stock price volatility are analyzed. There is a significant increase in the number of shareholders of added firms and a decline for deleted firms, but this factor has little influence for abnormal stock price returns. Similarly, for additions, institutional investors increases and volatility reduces, deletions are opposite. Abnormal stock price returns are significantly affected by the number of institutional investors and volatility. In addition, the company size is also a significant factor affecting the abnormal returns.

第一章 緒論 1
第一節 研究背景 1
第二節 研究動機與目的 3
第二章 理論綜述與文獻回顧 5
第一節 有效市場假說 5
第二節 指數成分股調整效應相關理論與文獻回顧 9
第三章 滬深300指數介紹與樣本選取 18
第一節 滬深300指數簡介 18
第二節 樣本選取 21
第四章 指數成分股調整的短期效應 24
第一節 研究方法 24
第二節 實證結果 26
第五章 指數成分股調整的長期影響 34
第一節 指數成分股調整對股價收益的長期影響 34
第二節 指數成分股調整對股票其他因素的長期影響 38
第三節 股價超額收益與各因素之間的關係 44
第六章 結論 47
參考文獻 49

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