. Using a difference-in-differences approach, we find that financial incentives induce a significant increase of the relative …

and control groups in difference-in-differences estimates. (V) We compared three different kinds of training and our …

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 …

group level. This is true for both pure treatment models and difference-in-differences regressions. Even when the number of …

outcomes and a menu of time-varying partial effects. Third, we obtain new results for nonlinear difference-in-differences with …