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題名:機構投資者鉅額交易訊息對股票市場效率之研究--轉換模式及介入模式之應用
書刊名:嶺東學報
作者:蔡垂君 引用關係
出版日期:2000
卷期:11
頁次:頁88-112
主題關鍵詞:效率市場假說CAPM模式機構投資者轉換模式介入模式
原始連結:連回原系統網址new window
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  • 共同引用共同引用:3
  • 點閱點閱:10
      Fama(1976)提出效率市場假說(Efficient Market Hypothesis,EMH)指出:股票 市場通常不具效率性,只要取得足夠之訊息則可能獲得超額報酬。本研究將訊息來源界定 為二:其一為依據CAPM模式所論,大盤報酬率是影響個股報酬率之主要因素,其次為投 資者重要參照團體─機構投資者─自營商及外資鉅額交易訊息,機構投資者通常被視為知 情投資者,每日鉅額交易之股票往往成為投資者參考對像。本研究以國內八十六年、八十 七兩年中機構投資者每日鉅額交易買進及賣出前五名之上市公司個股且成交量大於2500張 者為研究對象,採轉換模式及介入模式進行研究。研究目的有二:(1)以轉換模式及介入 模式模擬衡量個股報酬率之合適性。(2)探討大盤報酬率及機構投資者鉅額交易訊息是否 影響個股報酬率,當鉅額買進時因需求增加引發之價格拉力效果;當鉅額賣出時因供給增 加引發之價格壓力效果。經實證後結果可以得到結論有四:(1)採用之模式解釋能力達90 ﹪以上。(2)大盤報酬率對個股報酬率具長期及短期影響效果。(3)機構投資者鉅額交 易訊息對個股報酬率僅有短期影響效果。相較二類機構投資者鉅額交易訊息對於個股報酬 率之影響:自營商鉅額買進訊息引發需求面價格拉力效果的能力較強;外資賣出訊息引發 供給面價格壓力效果較強。由上推論可知,大盤報酬率仍是影響個股報酬率變化主因,運 用機構投資者鉅額交易訊息應即時同向操作方有獲利的機會,顯示臺灣股票市場仍不具效 率性。
期刊論文
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