In some surveys, the survey interview dates are scattered over many months. If a treatment unrelated to the survey purpose takes place during the survey period, then randomized data can obtain because individuals interviewed before and after the treatment timing are homogeneous. This happened in...

"This book reviews the three most popular methods (and their extensions) in applied economics and other social sciences: matching, regression discontinuity, and difference in differences. The book introduces the underlying econometric/statistical ideas, shows what is identified and how the...

We show that the main nonparametric identification finding of Abbring and Van den Berg (2003b, Econometrica) for the effect of a timing-chosen treatment on an event duration of interest does not hold. The main problem is that the identification is based on the competing-risks identification...