本章主要从价格动量策略以及证券投资基金的动量交易策略三个方面对中国股市的价格动量投资策略进行了系统性研究,本章成果可以概括如下:
(1)3.3节研究价格动量策略,分别运用了Jegadeesh和Titman(1993,2001)、Hong和Stein(2000)动量策略考察了中国股市是否存在中期价格动量效应,实证结果表明与美国等国证券市场完全不同,国内证券市场整体并不存在价格动量,不同规模组合个股亦未表现出动量效应。
(3)3.4节研究证券投资基金动量交易策略,以1998年2季度至2004年2季度证券投资基金季度末持有前10名重仓股为样本,实证发现,基金建仓或买入时采取动量交易策略,清仓或卖出时采取反转交易策略,然而基金总体并不表现为动量交易者;不同投资风格基金表现出趋同的交易模式,即买入时采取动量交易策略而卖出时采取反转交易策略,其中价值型基金和成长型基金交易行为存在一定差异。进一步分析发现,基金倾向于买进价值相对低估(高E/P、高BM)个股而卖出价值相对高估(低E/P、低BM)的大市值个股,其建仓个股在未来6个月表现出价格动量,清仓个股则表现出一定的价格反转趋势,显示基金交易活动加速了个股价值发现过程,亦支持了基金相对其他投资者具有一定信息优势的假设。
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§§第4章 风格水平动量投资策略研究