Modeling portfolio credit risk involves the default dependencies between the individual securities in a portfolio. The copula is a common approach to construct it. It parameterizes the joint distribution of individual defaults independently of their marginal distributions. The current market...

The dissertation consists of two major components on the topic of environmental valuation using spatial hedonic pricing models.The first component deals with the specification of a spatial hedonic model. The focus is on how to include the spatial effects of observed house prices into a hedonic...

Essay 1: Integrated Conditional MomentTest for Parametric Conditional Distributions (with Herman J. Bierens)This paper extends the Integrated Conditional Moment (ICM) test for the functional form of nonlinear regression models to tests for parametric conditional distributions. This test is...

Rivals may voluntarily share Research and Development (R&D) results even in the absence of any binding agreements or collusion. In a model where rival firms engage in non-cooperative independent R&D process, we used optimization and game theory analysis to study the equilibrium strategy of the...