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題名：臺灣股市三大法人群聚的實證研究
作者：方豪 引用關係
作者(外文)：Hao Fang
校院名稱：銘傳大學
系所名稱：管理研究所
指導教授：翁振益
盧陽正
學位類別：博士
出版日期：2009
主題關鍵詞：法人；群聚的價格影響；群聚；回饋交易；串流；herding；feedback trading；cascades；the price-impact of herding；institutional investors.
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本研究檢測臺灣股市三大法人的持股改變與家數及金額的買賣超之群聚衡量，是否會伴隨著群聚效應、回饋交易、串流及群聚的價格影響。本研究釐清在臺灣法人群聚行為，是否導源於資訊串流而非習慣性投資，且其群聚行為發生在那些特質性的股票。本研究建構一個更嚴謹的二維研究設計以釐清法人持股改變與報酬率、盈餘、淨值市價比或公司規模中之何項因子，能有效地解釋股票的超常報酬率，並調查介於持有期間的超常報酬率與相對應法人持股改變之間的橫斷面及時間序列關聯性。最後，本研究使用一個縱橫門檻迴歸模型以探討股市法人群聚對價格的變動是否會受公司規模所影響。
本研究重要的研究結果列示如下:
1. 外資及投信持股改變存在群聚效應，但自營商持股改變並沒有群聚效應。介於外資及投信持股改變與超常報酬率之間的群聚效應，主要源自於”持股改變驅動超常報酬率”。外資及投信持股改變展現正向回饋交易及串流現象；而自營商持股改變呈現負向回饋交易且不具串流現象。
2. QFIIs短期買超群聚衡量及其中長期賣超金額比率的群聚效應，導源於其正向回饋交易;然而QFIIs短中長期賣超群聚衡量，並未產生任何群聚效應。QFIIs短中期買超金額比率有明顯的群聚效應，其主要源自於群聚的價格影響。
3.本研究證實在考量動量交易下相臨兩個月QFIIs買進的比率有顯著的正相關。本研究更發現QFIIs資訊串流著重在過去贏家的股票、高度流動性的股票及成長性的股票。
4.二維研究設計的結果顯示報酬率、盈餘、淨值市價比及公司規模與三大法人持股改變，對不同持有期間超常報酬率都有明顯的影響。 此外，由前述四個變數中的任何一個所驅動的超常報酬率，都可能因為法人群聚程度而有所差異，且其相關性為正向。更重要的是，投資人可視”三大法人在持有期間的持股改變”為一項”短期追隨且反向調整”的訊號。
5.因為在臺灣股市外資傾向於操作臺灣上市公司中較大規模股票的價格，此種股票多被外資大幅買進，因而在後續超常報酬率有明顯的增加。一般投資人若追隨外資買進大規模廠商的股票，尤其是電子及塑膠產業並且持有這些投資組合一個月，將可獲得正向的超常報酬率。
This study examines whether share ownership adjustments and the herding measures of overbought and oversold on numbers and dollar amount by institutional investors in the Taiwan stock market are accompanied by herding effect, feedback trading, cascading and herding impact on price. This study clarifies whether institutional herding behavior in Taiwan results mainly from informational cascades rather than habit investing and on what types of stocks such herding behaviors occur. This study constructs a more rigorous two-dimensional research procedure to clarify which factor, including changes in institutional ownership with past returns, earnings, book-to-market ratio effect, or size effect can effectively interpret abnormal returns on stocks, and investigate the cross-sectional and time-series correlations between abnormal returns during holding periods and corresponding changes in institutional ownership. This study finally uses a panel threshold regression model to explore whether the price impact of institutional herding in this stock market is affected by firm size.
The most important outcomes of this study are listed below:
1.Herding effect was observed in share ownership adjustments of foreign investors and mutual funds, but not in share ownership changes of dealers. The herding effect between changes in share ownership of foreign investors and mutual funds and abnormal returns stems primarily from “changes in their share ownership driving abnormal returns”. Share ownership adjustments of foreign investors and mutual funds exhibit positive feedback trading and cascading, whereas negative feedback trading and no cascading were observed in changes in share ownership of dealers.
2.The short-term overbought herding measure and the mid-to-long-term oversold in dollar ratio by QFIIs are associated with herding effects resulting from positive feedback trading among QFIIs; however, short-to-mid-term and long-term oversold herding measures by QFIIs do not generate any herding effect. The short-to mid-term overbought in dollar ratio by QFIIs is associated with clear herding effects, resulting primarily from the price impact of herding.
3. This study demonstrates that there is a significantly positive relation in the fraction of QFIIs’ buying over the adjacent two months even after taking the momentum trading into account. We find that QFIIs’ informational cascades are focused on past winner stocks, highly-liquid stocks, and glamour stocks.
4. The two-dimensional research design revealed that all of the above variables and changes in share ownership of the three major types of institutional investors have remarkable influences on abnormal returns over various holding periods. In addition, the abnormal returns driven by any of the four variables proposed previously may vary depending on the level of herding; their correlations are positive. Most importantly, investors may regard “changes in shareholding by three major institutional investors during the holding period” as a signal of “short-term following and reverse adjustment.”
5. Since foreign investors in the Taiwan stock market prefer to hold large-size stocks in the TSE-listed firms, there is an apparent increase in the subsequent abnormal returns on such stocks bought in bulk by foreign investors. Other investors could follow foreign investors to purchase stocks of large-size firms in generally electronics and plastics sectors and hold them for one month to obtain positive abnormal returns.
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