Rethinking the Univariate Approach to Panel Unit Root Testing: Using Covariates to Resolve the Incidental Trend Problem
重新审视面板单位根检验的单变量方法:用协变量解决附带趋势问题AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要直接讨论面板单位根检验、附带趋势与单位根附近的局部功效,因而归入宏观面板和时间序列。
重新审视面板单位根检验的单变量方法:用协变量解决附带趋势问题AI 解读 ↓
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In an influential article, Hansen showed that covariate augmentation can lead to substantial power gains when compared to univariate tests. In this article, we ask if this result extends also to the panel data context? The answer turns out to be yes, which is maybe not that surprising. What is surprising, however, is the extent of the power gain, which is shown to more than outweigh the well-known power loss in the presence of incidental trends. That is, the covariates have an order effect on the neighborhood around unity for which local asymptotic power is negligible.