A simple framework for analysing bull and bear markets
分析牛市与熊市的简明框架AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要直接分析股价时间序列的生成过程,并评估资产定价模型重现牛熊周期的能力,因此对应时间序列和资产定价。
分析牛市与熊市的简明框架AI 解读 ↓
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Abstract Bull and bear markets are a common way of describing cycles in equity prices. To fully describe such cycles one would need to know the data generating process (DGP) for equity prices. We begin with a definition of bull and bear markets and use an algorithm based on it to sort a given time series of equity prices into periods that can be designated as bull and bear markets. The rule to do this is then studied analytically and it is shown that bull and bear market characteristics depend upon the DGP for capital gains. By simulation methods we examine a number of DGPs that are known to fit the data quite well—random walks, GARCH models, and models with duration dependence. We find that a pure random walk provides as good an explanation of bull and bear markets as the more complex statistical models. In the final section of the paper we look at some asset pricing models that appear in the literature from the viewpoint of their success in producing bull and bear markets which resemble those in the data. Copyright © 2002 John Wiley & Sons, Ltd.