本研究檢驗了台灣股票市場投資人情緒高低與從眾行為增加或減少,對動能策略報酬的影響,資料取自台灣經濟新報(TEJ),研究期間為2002年1月1日到2008年12月31日,資料頻率為月資料。從實證結果來看,台灣股票市場短期支持動能策略,當期間相對較長則較支持反向策略。 區分投資人情緒高低後發現,在投資人情緒高時,採用動能策略可以獲得顯著正報酬,但在相對長期時則採反向策略較佳,投資人情緒低時,相對短期與相對長期時採反向策略較容易獲得顯著正報酬,中期則採動能策略較佳,另外,實證結果也顯示出在投資人情緒高時使用動能策略,比在投資人情緒低時,容易獲得顯著正報酬。在投資人情緒增加與減少時的結果,可發現在投資人情緒增加時,相對短期與中期使用動能策略,相對長期使用反向策略,較能獲得顯著正報酬。在投資人情緒減少時,大致上在相對長期時採動能策略,相對短期時採反向策略,可以獲得顯著正報酬。 在從眾行為增加與減少的部份,實證結果顯示出在從眾行為減少時使用動能策略,比在從眾行為增加時,更容易獲得正報酬。
This study explores the effect of herding behavior and investor sentiment on momentum profits for stocks listed on the Taiwan Stock Exchange from 2002 to 2008. The empirical results show that short-term momentum profits hold and long-term contrarian profits hold on the Taiwan Stock market. The empirical results are similar to Jegadeesh and Titman (1993). In addition, our empirical results support that investor sentiment has impact on momentum profits. If the investor sentiment is high, momentum profits will continue. On the contrary, if the investor sentiment is low, then stock price will reverse in the short-term and long-term. The empirical results also show that short-term momentum profits hold and long-term contrarian profits hold when the investor sentiment is upward, and that long-term momentum profits hold and short-term contrarian profits hold when the investor sentiment is downward. The empirical results about the effect of herding behavior on momentum profits, momentum profits are more likely to occur for the herding behavior downward portfolio than for the upward portfolio.