Fernández Kranz, Daniel; Lechner, Michael; … - School of Economics and Political Science, Universität … - 2015
In this note, we show that the OLS and fixed-effects (FE) estimators of the popular differ-ence-in-differences model may deviate when there is time varying panel non-response. If such non-response does not affect the common-trend assumption, then OLS and FE are consistent, but OLS is more...