Most of the literature on the evaluation of training programs focuses on the effect of participation on a particular outcome (e.g. earnings). The "treatment" is generally represented by a binary variable equal to one if participation in the program occurs, and equal to zero if no participation...

The National Job Corps Study (NJCS) was a four-year longitudinal social experiment that randomized over 15,000 Job Corps eligible applicants into treatment and control groups. Experimental estimators revealed a positive impact of Job Corps training in the weekly earnings of white and black...

Researchers often identify degree effects by including degree attainment (D) and years of schooling (S) in a wage model, yet the source of independent variation in these measures is not well understood. We argue that S is negatively correlated with ability among degree-holders because the most...