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arXiv 1104.5667stat.MEstat.COstat.ML
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协整回归的模型选择一致性

Model Selection Consistency for Cointegrating Regressions

Eduardo F. Mendes

摘要:

研究了协整回归中所有协变量都是弱外生变量时自适应Lasso的渐近性质。我们假设候选I(1)变量的数量相对于样本量(但可能更大)是次线性的,候选I(0)变量的数量相对于样本量是多项式的。证明了在协整分析的经典条件下,该估计量渐近地选择模型中变量的正确子集,并且其渐近分布与OLS估计量的分布相同,因为模型中的变量是事先已知的(预言性质).我们还推导出一个算法的基础上的局部二次近似,并提出了一个数值研究,以显示在有限样本的方法的充分性。

英文摘要:

We study the asymptotic properties of the adaptive Lasso in cointegration regressions in the case where all covariates are weakly exogenous. We assume the number of candidate I(1) variables is sub-linear with respect to the sample size (but possibly larger) and the number of candidate I(0) variables is polynomial with respect to the sample size. We show that, under classical conditions used in cointegration analysis, this estimator asymptotically chooses the correct subset of variables in the model and its asymptotic distribution is the same as the distribution of the OLS estimate given the variables in the model were known in beforehand (oracle property). We also derive an algorithm based on the local quadratic approximation and present a numerical study to show the adequacy of the method in finite samples.

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