On Nonparametric Identi cation of Treatment Effects in Duration Models: This paper presents a simple counter-example to the main nonparametric identification finding of Abbring & Van den Berg (2003, Econometrica).
Re-Rebuttal on Nonparametric Identification of Treatment Effects in Duration Models: This is a re-rebuttal on the rebuttal by Abbing & Van den Berg (2016, IZA DP 10248) to the above paper. A main point is that the DGP advocated by Abbring & Van den Berg (2016) differs from the original DGP in Abbring & Van den Berg (2003); e.g., the control group in Abbring & Van den Berg (2003) has infinite waiting time to treatment, but the control group in Abbring & Van den Berg (2016) does not.