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題名:基本面與非基本面從眾行為與其對股票報酬影響之研究
作者:羅進水 引用關係
作者(外文):Chin-Shui Lo
校院名稱:國立雲林科技大學
系所名稱:管理研究所博士班
指導教授:李春安
學位類別:博士
出版日期:2007
主題關鍵詞:正向(反向)回饋交易從眾行為橫斷面離散程度Kalman filtercross-section dispersionherding behavior
原始連結:連回原系統網址new window
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投資人或許為了心理與實際安全感,選擇採取與他人相同的投資行為,在證券市場中,此一從眾行為可能引起資產價格出現齊漲或齊跌的異常現象,因此從眾行為常讓人有不理性的負面觀感。本研究採用Hwang and Salmon(2004)從眾指標衡量模型,將從眾行為進一步區分成依據基本面資訊執行交易的基本面從眾與刻意模仿他人行為的非基本面從眾行為,觀察此兩種從眾行為對股票報酬與波動的影響。
本研究的實證顯示,於市場上漲期間,與投資人心理情緒攸關的非基本面從眾交易雖會驅使資產偏離基本面價值,但顯著性較低。依據基本面資訊的從眾交易是一股反向的交易力量,可拉回偏離基本面的資產價值,且其影響力大於非基本面的從眾交易。在市場下跌期間,投資人心理情緒面的非基本面從眾行為對市場報酬有負面影響,基本面從眾行為對市場報酬有正向影響。但是非基本面從眾行為對於市場報酬的影響力亦不若基本面從眾行為的影響力。證券市場存在兩股相反的交易力量,因此不致於使資產價值過度偏離基本面應有的真實價值。此外,本研究實證也顯示非基本面從眾行為會增加市場的波動,基本面的從眾行為會降低市場的波動。
資產價格除部份反應基本面資訊的價值之外,也受到投資人心理因素的影響。本研究先以Daniel and Titman(2006)的基本面市值比分解模型與Clubb and Naffi(2007)的基本面評價模型的基本面變數,檢定基本面因子對台灣個股報酬的解釋能力,實證結果顯示基本面因素解釋報酬的能力普遍偏低。進一歩檢定投資人的從眾行為與非基本報酬關係,實證顯示機構投資人從眾行為對於非基本面報酬的影響力高於非機構投資人的從眾力量。再進一歩實證發現,非機構投資人是追漲殺跌的正向回饋交易策略,但非機構投資人的正向回饋交易行為並不具有資訊性,則此一追求趨勢的從眾行為可能會增加股市的波動,是證券市場一股潛在的不穩定力量。機構投資人漸漸成為逢高賣出,逢低買進的反向回饋交易者,而此機構投資人的反向回饋交易行為亦不具有資訊。此兩股相反的交易行為交互影響著市場的報酬與波動,因此應不致於使證券市場產生劇列的擾動。此外,本研究也證實非基本面的從眾交易正向的影響到非基本面的報酬。
Appling the herding measure of Hwang and Salmon (2004), this study decomposes investor’s herding behavior into fundamental-driven herding behavior and non-fundamental herding behavior induced by investor’s psychology. This study investigates both types of behaviors within Taiwan stock market over the period from January 1987 to March 2007. The empirical results indicate that the non-fundamental herding behavior may have less effect on market returns than the fundamental herding. Furthermore, the fundamental herding may have helped stabilize the stock market, whereas the non-fundamental herding may have increased market volatilities.
In addition to decomposing investor’s herding behavior into fundamental-driven and non-fundamental-driven herding behavior, this study also decomposes stock return into fundamental and non-fundamental returns. Our empirical results suggest that the fundamental variables of the models of Daniel and Titman (2006) and Clubb and Naffi (2007) do not efficiently explain stock returns. Furthermore, we find that institutional investors act as behavior-based contrarian investors and non-institutional investors are uninformed feedback traders. There are two groups of contrary traders on the same market, so extreme price movement seldom occurs. We also find that non-fundamental herding may notably affect market returns during bullish and bearish markets.
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