本章主要從價格動量策略以及證券投資基金的動量交易策略三個方麵對中國股市的價格動量投資策略進行了係統性研究,本章成果可以概括如下:
(1)3.3節研究價格動量策略,分別運用了Jegadeesh和Titman(1993,2001)、Hong和Stein(2000)動量策略考察了中國股市是否存在中期價格動量效應,實證結果表明與美國等國證券市場完全不同,國內證券市場整體並不存在價格動量,不同規模組合個股亦未表現出動量效應。
(3)3.4節研究證券投資基金動量交易策略,以1998年2季度至2004年2季度證券投資基金季度末持有前10名重倉股為樣本,實證發現,基金建倉或買入時采取動量交易策略,清倉或賣出時采取反轉交易策略,然而基金總體並不表現為動量交易者;不同投資風格基金表現出趨同的交易模式,即買入時采取動量交易策略而賣出時采取反轉交易策略,其中價值型基金和成長型基金交易行為存在一定差異。進一步分析發現,基金傾向於買進價值相對低估(高E/P、高BM)個股而賣出價值相對高估(低E/P、低BM)的大市值個股,其建倉個股在未來6個月表現出價格動量,清倉個股則表現出一定的價格反轉趨勢,顯示基金交易活動加速了個股價值發現過程,亦支持了基金相對其他投資者具有一定信息優勢的假設。
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§§第4章 風格水平動量投資策略研究