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上海股票市场年报信息与股价表现的经验研究 被引量:3

Empirical Research of the Annual Information and the After-Announcement Drift in Shanghai Stock Market
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摘要 以上海A股市场为样本 ,研究市场中股票价格对年报信息的反应。有以下 3种现象 :年报信息不导致显著的日回报的超常回报 ;上海股票市场同时存在反应过度和反应不足 ;年报信息导致显著的累积超常回报。上海股票市场的齐涨齐跌现象使得即使是业绩最差的股票在年报公告后 ,在一段牛市行情中也有正的累积回报。在较长的时期以后 ,业绩表现与累积超常回报率的一致性消失 ,市场回报率出现随机性。说明年报信息的效应在约 4 5个交易日或两个月后消失。
出处 《华南师范大学学报(社会科学版)》 CSSCI 2002年第5期45-53,共9页 Journal of South China Normal University:Social Science Edition
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