LANGENSKIÖLD, Sophie; RUBIN, Donald B. - In: Annales d'Economie et de Statistique (2008) 91-92, pp. 107-125
For estimating causal effects of treatments, randomized experiments are appropriately considered the gold standard, although they are often infeasible for a variety of reasons. Nevertheless, nonrandomized studies can and should be designed to approximate randomized experiments by using only...