Unpublished paper (1987): The Sensitivity of Duration Models to Unobserved Heterogeneity and Duration Dependence <pdf>

The Econometrics of Data Combination  <pdf>

Estimation of Nonlinear Models with Measurement Error Using Marginal
Information <pdf>

Correcting for Selective Compliance in a Re-employment Bonus Experiment  <pdf>

The Singularity of the Information Matrix of the Mixed Proportional Hazard Model <addendum>

Efficient Estimation of Average Treatment Effects Using the Estimated Propensity Score <addendum>

 On Deconvolution as a First-Stage Nonparametric Estimator <pdf> September 2005

 Mean-squared-error Calculations for Average Treatment Effects <pdf> September 2005