新闻聚合度：金融市场系统性风险的指标
News Cohesiveness: an Indicator of Systemic Risk in Financial Markets
摘要：
受最近金融危机的影响，人们对金融市场的传染效应和羊群行为进行了大量的研究。关于金融新闻对金融市场的影响，人们说得更少。我们提出了一种新的衡量金融新闻在网络上的集体行为，新闻凝聚力指数（NCI），并表明它可以被用来作为一个系统性风险指标。我们从2011年10月到2013年7月每天评估来自大型网络新闻来源的金融文件的NCI，并分析金融市场和金融相关新闻之间的相互作用。我们假设，金融新闻的强凝聚力反映了金融市场的走势。凝聚力是对新闻中所表达的系统性风险的更普遍和更有力的衡量，而不是基于特定术语的简单出现的衡量。我们的研究结果表明，在金融新闻的凝聚力是高度相关的，并在金融市场的波动性驱动。
英文摘要：
Motivated by recent financial crises significant research efforts have been put into studying contagion effects and herding behaviour in financial markets. Much less has been said about influence of financial news on financial markets. We propose a novel measure of collective behaviour in financial news on the Web, News Cohesiveness Index (NCI), and show that it can be used as a systemic risk indicator. We evaluate the NCI on financial documents from large Web news sources on a daily basis from October 2011 to July 2013 and analyse the interplay between financial markets and financially related news. We hypothesized that strong cohesion in financial news reflects movements in the financial markets. Cohesiveness is more general and robust measure of systemic risk expressed in news, than measures based on simple occurrences of specific terms. Our results indicate that cohesiveness in the financial news is highly correlated with and driven by volatility on the financial markets.
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。
