Research Staff
Sokbae (Simon) Lee
Columbia University and IFS
Selected Publications
We develop a general class of nonparametric tests for treatment effects conditional on covariates. We consider […]
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We develop a practical and novel method for inference on intersection bounds, namely bounds defined by […]
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This paper is concerned with developing uniform confidence bands for functions estimated nonparametrically with instrumental variables. […]
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This paper presents new evidence that increases in college enrollment lead to a decline in the […]
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This paper extends the method of local instrumental variables developed by Heckman and Vytlacil (1999, 2001, […]
We propose a test of the hypothesis of stochastic monotonicity. This hypothesis is of interest in […]
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This paper is concerned with inference about a function g that is identified by a conditional […]
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This paper develops a concrete formula for the asymptotic distribution of two-step,possibly non-smooth semiparametric M-estimators under […]
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We consider nonparametric estimation of a regression function that is identified byrequiring a specified quantile of […]
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This paper is concerned with identification of a competing risks model with unknown transformations of latent […]