Riener, Gerhard; Schneider, Sebastian O.; Wagner, Valentin - 2020
generalizability of field experiments: the internal and external overlap and unconfoundedness conditions. We experimentally varied the … degree of overlap in disjoint sub-samples from a recruitment experiment with more than 3,000 public schools, mimicking small … improved overlap by balancing covariate dependencies and variances instead of focusing on individual mean values. We assess the …