Working Papers (unpublished)

Incentives and Services for College Achievement: Evidence from a Randomized Trial
(with Phil Oreopoulos and Dan Lang)
October 2007

Long-Term Consequences of Vietnam-era Conscription: Schooling, Experience, and Earnings
(with Stacey Chen)
September 2007

The Effect of High-stakes High-school Achievement Awards: Evidence from a Group-Randomized Trial
(with Victor Lavy)
September 2007 revision of NBER Working Paper 9389

Lead Them to Water and Pay Them to Drink: An Experiment with Services and Incentives for College Achievement
(with Phil Oreopoulos and Dan Lang)
December 2006

Multiple Experiments for the Causal Link Between the Quantity and Quality of Children
(with Victor Lavy and Analia Schlosser)
September 2006

New Evidence on the Causal Link Between the Quantity and Quality of Children
(with Victor Lavy and Analia Schlosser)
December 2005, NBER w11835

Semiparametric Causality Tests Using the Policy Propensity Score
(with Guido M. Kuersteiner)
December 2004, NBER w10975

The Effect of High School Matriculation Awards: Evidence from Randomized Trials.
(with Victor Lavy)
December 2002, NBER w9389

When to Control for Covariates? Panel-Asymptotic Results for Estimates of Treatment Effects.
(with Jinyong Hahn)
May 1999, NBER t0241

The Palestinian Labor Market Between the Gulf War and Autonomy
May 1998, MIT Economics Department Working Paper

The Effect of Teen Childbearing and Single Parenthood on Childhood Disabilities and Progress in School.
October 1996, NBER w5807

Conditioning on the Probability of Selection to Control Selection Bias
October 1996, NBER t0181