Most papers that use staggered difference-in-differences seem to use regression evidence instead of graphical evidence to demonstrate parallel trends in the pre-treatment period. I think this is because there is no clear way to code the date relative to treatment shock for the control group, since there are multiple treatment shocks.
Is there a way to plot a parallel trends graph for staggered difference-in-differences nonetheless?
Is there a way to plot a parallel trends graph for staggered difference-in-differences nonetheless?
