LPPL:股市影响国债收益率的证据
文章 arXiv papers · 作者: W. -X. Zhou et al.
总结
论文将对数周期幂律(LPPL)模式应用于美国国债收益率,并以行为羊群框架解释。研究报告称,10 月 2000 起,一年以上期限的收益率出现反泡沫模式。在该框架中,反泡沫是旨在刻画集体羊群行为的一种特定 LPPL 形式;作者使用参数和非参数方法进行检验。
为考察不同市场和期限之间的关系,研究分析拟合的 LPPL 参数如何随收益率期限变化,并使用标普 500 与债券收益率之间的滞后交叉相关性。作者将结果解释为一条因果链:影响从股市经过美联储政策和短期收益率传至长期收益率,同时股票也直接影响长期收益率。这是作者对历史模式的解读,其中包括股票代表经济前景的观点。现有描述不能证明 LPPL 模式确立了因果关系,也不能证明这种关系适用于研究时期之外。
核心观点
- 研究使用 LPPL 模式识别长期限国债收益率中所提出的反泡沫。
- 证据结合了参数和非参数检验、期限比较以及滞后交叉相关分析。
- 作者提出影响可能从股票经由政策和短期收益率传至长期收益率。
- 研究结果支持一种历史解读,但本身不能证明因果机制或更广泛的适用性。
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全文
# Causal Slaving of the U.S. Treasury Bond Yield Antibubble by the Stock Market Antibubble of August 2000 # Causal Slaving of the U.S. Treasury Bond Yield Antibubble by the Stock Market Antibubble of August 2000 Using the descriptive method of log-periodic power laws (LPPL) based on a theory of behavioral herding, we use a battery of parametric and non-parametric tests to demonstrate the existence of an antibubble in the yields with maturities larger than 1 year since October 2000. The concept of ``antibubble'' describes the existence of a specific LPPL pattern that is thought to reflect collective herding effects. From the dependence of the parameters of the LPPL formula as a function of yield maturities and using lagged cross-correlation calculations between the S&P 500 and bond yields, we find strong evidence for the following causality: Stock Market $\to$ Fed Reserve (Federal funds rate) $\to$ short-term yields $\to$ long-term yields (as well as a direct and instantaneous influence of the stock market on the long-term yields). Our interpretation is that the FRB is ``causally slaved'' to the stock market (at least for the studied period), because the later is (taken as) a proxy for the present and future health of the economy.
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