Before revision:  An Empirical Monte Carlo study shows that they may outperform previously suggested estimators . Inference tends to be accurate for effects relating to larger groups and conservative for effects relating to fine levels of granularity. An application to the evaluation of an active labour market programme shows the value of the new methods for applied research.
After revision:  An Empirical Monte Carlo study shows that they may outperform previously suggested estimators , an application to the evaluation of an active labour market programme shows the value of the new methods for applied research.