Research Staff
Sokbae (Simon) Lee
Columbia University and IFS
Selected Publications
In this article, we develop a general method for testing threshold effects in regression models, using […]
Previous version
We develop a practical and novel method for inference on intersection bounds, namely bounds defined by […]
Latest version
Previous version
This paper presents new evidence that increases in college enrollment lead to a decline in the […]
Previous version
We examine the “home bias” of knowledge spillovers (the idea that knowledge spreads more slowly over […]
In parametric models a sufficient condition for local identification is that the vector of moment conditions […]
Latest version
This paper develops tests for inequality constraints of nonparametric regression functions. The test statistics involve a […]
Latest version
Blau and Kahn (JOLE, 1997; ILRR, 2006) decomposed trends in the U.S. gender earnings gap into […]
Latest version
This paper develops a concrete formula for the asymptotic distribution of two-step, possibly non-smooth semiparametric M-estimators […]
Previous version
In this article, we develop a general method for testing threshold effects in regression models, using […]
Latest version
This paper is concerned with developing uniform confidence bands for functions estimated nonparametrically with instrumental variables. […]