In 1954 the Supreme Court of the United States ruled that separate schools for black and white children were 'inherently unequal.' This paper studies whether the desegregation plans of the next 30 years in fact benefited the black students for whom the plans were designed. Analysis of data from...

In 1954 the Supreme Court of the United States ruled that separate schools for black and white children were 'inherently unequal.' This paper studies whether the desegregation plans of the next 30 years in fact benefited the black students for whom the plans were designed. Analysis of data from...

Problems of sample selection arise in the analysis of both experimental and non-experimental data. In clinical trials to evaluate the impact of an intervention on health and mortality, treatment assignment is typically nonrandom in a sample of survivors even if the original assignment is random....

The average effect of intervention or treatment is a parameter of interest in both epidemiology and econometrics. A key difference between applications in the two fields is that epidemiologic research is more likely to involve qualitative outcomes and nonlinear models. An example is the recent...

This essay reviews progress in empirical economics since Leamer's (1983) critique. Leamer highlighted the benefits of sensitivity analysis, a procedure in which researchers show how their results change with changes in specification or functional form. Sensitivity analysis has had a salutary but...