based on a conditional difference-in-differences method. We find that the supply of used VW diesel vehicles increases after …

. As hospitals had a transition period of several years to complete the switch, we can adopt a difference-in-differences …

, selection on observables, and difference-in-differences. We also present an application to a policy intervention extending …

the policy change, which consists of stricter entry requirements. Our empirical strategy uses conditional difference-in-differences … difference-in-differences are biased if used on their own. We then derive conditions that are required to obtain a consistent … estimator using a combination of conditional difference-in-differences and Bai's (2009) least squares estimator. The results …

We exploit the exogenous variations of arsenic contamination across regions in Cambodia and apply two-period difference-in-differences …

tracks at different schools) to get difference-in-differences (DD) estimates for all students above the admission cutoff …