Difference-in-differences for categorical outcomes.
John A GravesCarrie E FryJ Michael McWilliamsLaura Anne HatfieldPublished in: Health services research (2022)
By comparing the assumption that marginals are evolving in parallel to an assumption about transitions across outcome values, we illustrate the scale-dependence of difference-in-differences. Our application shows that studying transitions can illuminate nuances obscured by changes in the marginals.