The difference-in-difference method: Assessing the selection bias in the effects of neighborhood environment on health

Freedman, Vicki A; Grafova, Irina B; Lurie, Nicole; Kumar, Rizie; Rogowski, Jeannette. (2014). The difference-in-difference method: Assessing the selection bias in the effects of neighborhood environment on health. Economics & Human Biology. 13, 20-33.