Optimal Inference for Instrumental Variables Regression with non-Gaussian Errors

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英文文献：Optimal Inference for Instrumental Variables Regression with non-Gaussian Errors
英文文献作者：Mathias D. Cattaneo,Richard K. Crump,Michael Jansson
英文文献摘要：
This paper is concerned with inference on the coefficient on the endogenous regressor in a linear instrumental variables model with a single endogenous regressor, nonrandom exogenous regressors and instruments, and i.i.d. errors whose distribution is unknown. It is shown that under mild smoothness conditions on the error distribution it is possible to develop tests which are “nearly” efficient when identification is weak and consistent and asymptotically optimal when identification is strong. In addition, an estimator is presented which can be used in the usual way to construct valid (indeed, optimal) confidence intervals when identification is strong. The estimator is of the two stage least squares variety and is asymptotically efficient under strong identification whether or not the errors are normal.

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