研究前沿概念最早由耶鲁大学Price于1965年提出,指的是科学家积极引用文章的主要部分。一个研究前沿大概由40~50篇最近发表的文章组成(Price,1965)。研究前沿通常在分析突现文献和突现词的基础上,结合对施引文献的分析,进行综合判断和探测,...
But there is still plenty that can go wrong. The overall market is on a cyclically adjusted price-earnings ratio of 30—a level surpassed only in 1929 and the late 1990s. If the Federal Reserve tightens policy too aggressively, or the...
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