Publications

• Dealing with Limited Overlap in Estimation of Average Treatment Effects
  (with Richard Crump, V. Joseph Hotz and Guido Imbens)
  Biometrika, Vol. 96, Number 1, 187-199, March 2009.
  Abstract
  Paper [Previous version: NBER WP # t0330; and IZA DP #2347; October 2006]
  Matlab program to estimate optimal cutoff
  Stata program to estimate optimal cutoff (install both files below in your ado folder)
  - Ado file
  - Help file
  

• Nonparametric Tests for Treatment Effect Heterogeneity
  (with Richard Crump, V. Joseph Hotz and Guido Imbens)
  The Review of Economics and Statistics, Vol. XC, Number 3, 389-405, August 2008
  Abstract
  Paper [Previous version: NBER WP # t0324; IZA DP #2091; June 2006]
  Additional Proofs
  Matlab program to estimate tests
  Stata program to estimate tests (install both files below in your ado folder)
  - Ado file
  - Help file
  

Working Papers

• Evaluating Nonexperimental Estimators for Multiple Treatments: Evidence from Experimental Data
  (with Carlos Flores) (September 2009)
  Abstract
  Paper [Also as IZA DP # 4451]
  
• CEO Power and Compensation in Financially Distressed Firms
  (with Qiang Kang) (November 2009)
  Abstract
  Paper [Earlier version circulated as IZA DP # 3877]
• How do Training Programs Assign Participants to Training? Characterizing the Optimal Assignment Rules of Government Agencies for Welfare-to-Work Programs in California
  (December 2008)
  Abstract
  Paper [Also as IZA DP # 4024]
  
• Intergenerational transmission of welfare dependency: The effects of length of exposure
  (March 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)
• The unintended consequences of the EITC: The effects on obesity of increased labor force participation
  (with Pedro Gomis-Porqueras and Adrian Peralta-Alva)
• Pork-barrel spending and congressional elections in the U.S.
  (with Luca Bossi)