Working Papers

• Intergenerational transmission of welfare dependency: The effects of length of exposure
  (March 2008)
  Abstract
  Paper
• Dealing with Limited Overlap in Estimation of Average Treatment Effects
  (with Richard Crump, V. Joseph Hotz and Guido Imbens)
  (June 2007)
  Abstract
  Paper
  [Previous version circulated as "Moving the Goalposts: Addressing Limited Overlap in Estimation of Average Treatment Effects by Changing the Estimand", NBER WP # t0330; and IZA DP #2347; October 2006]
  

• Nonparametric Tests for Treatment Effect Heterogeneity
  (with Richard Crump, V. Joseph Hotz and Guido Imbens)
  (May 2007, forthcoming The Review of Economics and Statistics)
  Abstract
  Paper [Previous version: NBER WP # t0324; IZA DP #2091; June 2006]
  Additional Proofs
  
• How do Training Programs Assign Participants to Training? Characterizing the Optimal Assignment Rules of Government Agencies for Welfare-to-Work Programs in California
  (June 2008)
  Abstract
  Paper
  
• Differential Effects of Welfare-to-Work Programs: Identification with Unknown Treatment Status
  (December 2005)
  Abstract
  Paper
  

Work in Progress

• Comparing Estimators for Average Treatment Effects with Many Covariates
  (with V. Joseph Hotz and Guido Imbens)
• An evaluation of non-experimental estimators for multiple treatments
  (with Carlos Flores)
• The unintended consequences of the EITC: The effects on obesity of increased labor force participation
  (with Pedro Gomis-Porqueras and Adrian Peralta-Alva)
• Executive compensation in financially distressed firms
  (with Qiang Kang)
• Pork-barrel spending and congressional elections in the U.S.
  (with Luca Bossi)