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arXiv 1202.0100q-fin.ST
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US中股票市场有效性的演化--基于非贝叶斯时变模型的分析

The Evolution of Stock Market Efficiency in the US: A Non-Bayesian Time-Varying Model Approach

Mikio Ito, Akihiko Noda, Tatsuma Wada

摘要:

通过引入随时间变化的市场有效性程度的概念,建立了一个非贝叶斯时变模型。这一模式可被视为反映了这样一种观点,即不断的技术进步会随着时间的推移改变贸易环境。我们用新的方法和市场有效性程度的新衡量标准来检验美国股票市场是否随着时间的推移而演变。特别地,采用时变自回归(TV-AR)模型。我们的主要发现是:(1)美国股票市场是随着时间的推移而演变的,市场有效性的程度具有相当长的周期性波动,从30年到40年;(2)美国股票市场一直是有效的,除了我们样本期内的四次:1873-1879年的长期衰退; 1902-1904年的衰退;新政时代;以及1957-1958年及其后的经济衰退,并表明我们的结果与行为金融学的观点部分一致。

英文摘要:

A non-Bayesian time-varying model is developed by introducing the concept of the degree of market efficiency that varies over time. This model may be seen as a reflection of the idea that continuous technological progress alters the trading environment over time. With new methodologies and a new measure of the degree of market efficiency, we examine whether the US stock market evolves over time. In particular, a time-varying autoregressive (TV-AR) model is employed. Our main findings are: (i) the US stock market has evolved over time and the degree of market efficiency has cyclical fluctuations with a considerably long periodicity, from 30 to 40 years; and (ii) the US stock market has been efficient with the exception of four times in our sample period: during the long-recession of 1873-1879; the recession of 1902-1904; the New Deal era; and the recession of 1957-1958 and soon after it. It is then shown that our results are partly consistent with the view of behavioral finance.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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