LAG Length Selection and the Construction of Unit Root Tests with Good Size and Power
滞后阶数选择与兼具良好尺寸和功效的单位根检验AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要聚焦单位根检验、增广自回归滞后阶数与 GLS 去趋势,直接涉及时间序列的平稳性检验及其尺寸和功效表现。
滞后阶数选择与兼具良好尺寸和功效的单位根检验AI 解读 ↓
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It is widely known that when there are errors with a moving-average root close to −1, a high order augmented autoregression is necessary for unit root tests to have good size, but that information criteria such as the AIC and the BIC tend to select a truncation lag (k) that is very small. We consider a class of Modified Information Criteria (MIC) with a penalty factor that is sample dependent. It takes into account the fact that the bias in the sum of the autoregressive coefficients is highly dependent on k and adapts to the type of deterministic components present. We use a local asymptotic framework in which the moving-average root is local to −1 to document how the MIC performs better in selecting appropriate values of k. In Monte-Carlo experiments, the MIC is found to yield huge size improvements to the DFGLS and the feasible point optimal PT test developed in Elliott, Rothenberg, and Stock (1996). We also extend the M tests developed in Perron and Ng (1996) to allow for GLS detrending of the data. The MIC along with GLS detrended data yield a set of tests with desirable size and power properties.