This paper studies nonparametric estimation of conditional moment restrictions in which the generalized residual functions can be nonsmooth in the unknown functions of endogenous variables. This is a nonparametric nonlinear instrumental variables (IV) problem. We propose a class of penalized...

Parametric mixture models are commonly used in applied work, especially empirical economics, where these models are often employed to learn for example about the proportions of various types in a given population. This paper examines the inference question on the proportions (mixing probability)...

In parametric models a sufficient condition for local identification is that the vector of moment conditions is differentiable at the true parameter with full rank derivative matrix. We show that additional conditions are often needed in nonlinear, nonparametric models to avoid nonlinearities...

This dissertation employs high-frequency data and techniques to examine various topics in financial markets. Chapter 1 compares forward regression model with eight statistical/practical trading exchange rate models in terms of forecasting foreign exchange rates. Superior forecast power of the...

This dissertation studies the distributions of treatment effects in switching regimes models (SRMs). First, we propose a general class of SRMs and provide simple estimators of average treatment effects. Second, we establish sharp bounds on the joint distribution of potential outcomes and the...

In this dissertation, we evaluate the efficiency of electric utilities in the United States since 1997, and determine whether investor owned electric utilities (IOUs) and cooperatives (COOPs) achieve higher cost, technical and allocative efficiency and greater financial performance than publicly...

My dissertation focuses on partial identification of the distribution function of treatment effects. When treatment effects are believed to be heterogeneous, policy evaluation often requires knowledge of the distribution function of potential treatment effects. This function cannot be...

The main focus of this thesis is the study of distributional aspects of income and other dimensions of well-being. The first two essays pertain to the use of multidimensional poverty techniques. In the third essay I discuss a different distributional aspect, the middle class as captured by...