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arXiv 0907.3503math.STstat.TH
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相交边界:估计和推断

Intersection Bounds: Estimation and Inference

Victor Chernozhukov, Sokbae Lee, Adam M. Rosen

摘要:

我们开发了一个实用的和新颖的方法推理相交的界限,即定义的下确界或上确界的参数或非参数函数,或等价地,一个潜在的无限约束集的线性规划问题的值。我们发现,在计量经济学中的许多边界特征,例如条件矩不等式下的参数的边界,可以制定为相交边界。我们的方法是特别方便的模型组成的一个连续的不平等是可分离的参数,也适用于模型的不平等是不可分离的参数。由于模拟估计交叉界限可以严重偏置在有限的样本,经常低估的大小确定的集合,我们还提供了一个中位数偏差校正估计这样的界限作为我们的推理过程的副产品。我们开发的大样本推理理论的基础上的一系列或基于内核的经验过程的序列的强近似的“倒数第二”高斯过程的序列。这些倒数第二个过程一般不是弱收敛的,因此是非Donsker的。我们的理论结果表明,我们仍然可以执行渐近有效的推断基于这些过程。我们的构造还提供了新的自适应不等式/矩选择方法。我们提供了使用非参数核和系列估计的条件,包括一个新的结果,建立强逼近任何一般系列估计承认线性化,这可能是独立的利益。

英文摘要:

We develop a practical and novel method for inference on intersection bounds, namely bounds defined by either the infimum or supremum of a parametric or nonparametric function, or equivalently, the value of a linear programming problem with a potentially infinite constraint set. We show that many bounds characterizations in econometrics, for instance bounds on parameters under conditional moment inequalities, can be formulated as intersection bounds. Our approach is especially convenient for models comprised of a continuum of inequalities that are separable in parameters, and also applies to models with inequalities that are non-separable in parameters. Since analog estimators for intersection bounds can be severely biased in finite samples, routinely underestimating the size of the identified set, we also offer a median-bias-corrected estimator of such bounds as a by-product of our inferential procedures. We develop theory for large sample inference based on the strong approximation of a sequence of series or kernel-based empirical processes by a sequence of "penultimate" Gaussian processes. These penultimate processes are generally not weakly convergent, and thus non-Donsker. Our theoretical results establish that we can nonetheless perform asymptotically valid inference based on these processes. Our construction also provides new adaptive inequality/moment selection methods. We provide conditions for the use of nonparametric kernel and series estimators, including a novel result that establishes strong approximation for any general series estimator admitting linearization, which may be of independent interest.

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