Maximum Likelihood Estimation and Uniform Inference with Sporadic Identication Failure

نویسندگان

  • Donald W. K. Andrews
  • Xu Cheng
چکیده

This paper analyzes the properties of a class of estimators, tests, and con…dence sets (CS’s) when the parameters are not identi…ed in parts of the parameter space. Speci…cally, we consider estimator criterion functions that are sample averages and are smooth functions of a parameter : This includes log likelihood, quasi-log likelihood, and least squares criterion functions. We determine the asymptotic distributions of estimators under lack of identi…cation and under weak, semi-strong, and strong identi…cation. We determine the asymptotic size (in a uniform sense) of standard t and quasi-likelihood ratio (QLR) tests and CS’s. We provide methods of constructing QLR tests and CS’s that are robust to the strength of identi…cation. The results are applied to two examples: a nonlinear binary choice model and the smooth transition threshold autoregressive (STAR) model. Keywords: Asymptotic size, binary choice, con…dence set, estimator, identi…cation, likelihood, nonlinear models, test, smooth transition threshold autoregression, weak identi…cation. JEL Classi…cation Numbers: C12, C15.

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تاریخ انتشار 2012