1. Semiparametric estimation of censored selection models with a non-parametric selection mechanism;Ahn;Journal of Econometrics,1993
2. Semiparametric estimation of a sample selection model;Andrews;LSE mimeo,1996
3. Union coverage differentials for Britain using the NES;Andrews,1996
4. The estimation of the union wage differentials for Britain using individual level data;Andrews;Manchester discussion paper 9524,1995
5. Nonparametric and semiparametric methods in Econometrics and Statistics;Barnett,1991