A Bayesian Robust Detection of Shift in the Risk Structure of Stock Market Returns
股票收益风险结构变化的贝叶斯稳健检测AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要明确分析代表个股系统性风险暴露的beta系数及其变化,与金融因子暴露分析直接相关。
股票收益风险结构变化的贝叶斯稳健检测AI 解读 ↓
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In this article we provide a statistical procedure for the analysis of stock market prices that is robust toward departures from the normal distribution assumption and that can detect and evaluate a shift of parameters at an unknown time point. The method is an adaptation of a Bayesian inferential procedure developed by Box and Tiao that allows data to deviate moderately from the normal distribution model. It is applied to a set of U.S. stock market prices for 1971–1974. In addition to the detection of shift in distribution parameters, the procedure is also applied to the examination of shift of the “beta coefficients” that represent the degree of undiversifiable (systematic) risk of individual securities. Implications of the empirical findings for financial theories and their applications are sketched.