Maximum Likelihood Estimation and Uniform Inference with Sporadic Identication Failure
نویسندگان
چکیده
This paper analyzes the properties of a class of estimators, tests, and con dence sets (CSs) 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 CSs. We provide methods of constructing QLR tests and CSs 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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