Using data from seven cohorts of language immersion lottery applicants in a large, urban school district, we estimate the causal effects of immersion on students' test scores in reading, mathematics, and science, and on English learners' (EL) reclassification. We estimate positive...

In randomized controlled trials, it is common for attrition rates to differ by lottery status, jeopardizing the identification of causal effects. Inverse probability weighting methods (Hirano et al, 2003; Busso et al., 2014) and estimation of informative bounds for the treatment effects (e.g. Lee, 2009;...