Developed methods for handling selective samples in a statistically satisfactory way. He also showed how similar methods can be used to evaluate the effect of public labour market programmes and educational programmes, and to estimate the effect of length of unemployment on the probability of getting a job.
1, Dynamic Treatment Effects.
2, The Economic Of Human Development & Social Mobility (2014).
3, Forecasting and measuring skills: Interventions that improve character and cognition (2014).