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In their IZA Discussion Paper 10247, Johansson and Lee claim that the mainresult (Proposition 3) in Abbring and Van den Berg (2003b) does not hold. Weshow that their claim is incorrect. At a certain point within their line ofreasoning, they make a rather basic error while transforming one randomvariable into another random variable, and this leads them to draw incorrectconclusions. As a result, their paper can be discarded.

Rebuttal of "On Nonparametric Identification of Treatment Effects in Duration Models"