摘要翻译：
世界各地的金融市场没有相同的工作时间。因此，研究金融市场指数之间的相关性或因果关系就取决于在计算相关矩阵时应该考虑当日所有指数还是滞后指数。本文提出的答案是，我们应该两者兼顾。本文利用全球79个不同股票市场的指数来研究它们之间的相关性结构，发现原始指数和滞后指数在同一网络中的表现，使我们能够更好地理解不同时间运行的指数之间的关系。
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英文标题：
《To lag or not to lag? How to compare indices of stock markets that
  operate at different times》
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作者：
Leonidas Sandoval Junior
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最新提交年份：
2013
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分类信息：

一级分类：Quantitative Finance        数量金融学
二级分类：General Finance        一般财务
分类描述：Development of general quantitative methodologies with applications in finance
通用定量方法的发展及其在金融中的应用
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英文摘要：
  Financial markets worldwide do not have the same working hours. As a consequence, the study of correlation or causality between financial market indices becomes dependent on wether we should consider in computations of correlation matrices all indices in the same day or lagged indices. The answer this article proposes is that we should consider both. In this work, we use 79 indices of a diversity of stock markets across the world in order to study their correlation structure, and discover that representing in the same network original and lagged indices, we obtain a better understanding of how indices that operate at different hours relate to each other.
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PDF链接：
https://arxiv.org/pdf/1201.4586