De Chaisemartin, Clément de Chaisemartin; … - Centre de Recherche en Économie et Statistique … - 2014
The changes-in-changes model extends the widely used difference-in-differences to situations where outcomes may evolve heterogeneously. Contrary to difference-in-differences, this model is invariant to the scaling of the outcome. This paper develops an instrumental variable changes-in-changes...