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漫步周内效应:来自中国A股市场行业数据的检验

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摘要 “漫步周内效应”,即具有时变性的“周内效应”。文章通过使用中国A股市场的行业数据对其进行研究:首先,实证发现漫步周内效应在23个行业指数中普遍存在且异常显著,说明中国股市依然存在较大的无效性;其次,周内效应显著性并无逐年减弱趋势而是呈波浪型变化,这与有效市场理论不符而进一步支持了漫步周内效应;最后,本文还发现效应显著性大小与牛、熊市的出现时间密切相关,据此指出投资者并非是完全理性的,而投资者的理性程度高低正是影响“周内效应”等日历效应是否存在及其显著程度高低的重要因素之一。
作者 程力耘
出处 《世界经济情况》 2011年第5期64-69,56,共7页 World Economic Outlook
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