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台股指數期貨市場日內過度反應之研究

Intraday Overreaction of Index Futures Market in Taiwan

摘要


本研究乃是以Fung, Mok, and Lam (2000)及Grant, Wolf, and Yu (2005)對股價指數期貨市場日內價格過度反應現象之實證模式設計技巧,探討台股指數期貨市場是否存在日內過度反應現象,即當市場有顯著的隔夜開盤報酬率時,是否會有一顯著的價格反轉。實證結果發現,台股指數期貨市場並沒有出現顯著的日內價格反轉,故不支持日內過度反應假說;反之,本文發現台股指數期貨市場在市場開盤後呈現顯著的報酬動能效應,有隔夜資訊反應不足現象,昨天收盤來不及反應的訊息延至隔天5、15分鐘仍繼續反應。

並列摘要


The purpose of this study is to investigate whether intraday overreaction occurs in Taiwan index futures market using the standard event-study methodology in Fung, Mok, and Lam (2000) and Grant, Wolf, and Yu (2005). Our empirical results show no evidence of price reversals. On the contrary, this study finds significant intraday momentum effects following large price changes at the market open, suggesting that there exists overnight underreaction phenomenon in Taiwan index futures market. The results will be helpful for the authorities that regulate futures market to improve market efficiency.

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