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1·The contrarian effect of Shanghai Stock Exchange A - shares is investigated using a traditional financial index based on 180 A - shares sample data from 1999 to 2003.

基于1999年至2003年“上证”180家上市公司的A股数据，采用传统财务指标研究了“上证”A股市场的反转效应问题。

2·One of them is overreaction (contrarian effect). It not only has influence on investors' decision-making behavior, but also has something to do with the efficiency of the financial market.

过度反应现象（反转效应）就是其中之一，它不仅影响到投资者的决策行为，而且还关系到金融市场是否有效的问题。