Diagnostic Test of the Parallel Trends Assumption. This figure plots
When Is Parallel Trends Sensitive To Functional Form. We prove that the parallel. Web our first main result characterizes when the parallel trends assumption is invariant to transformations.
We prove that the parallel. Web our first main result characterizes when the parallel trends assumption is invariant to transformations.
We prove that the parallel. We prove that the parallel. Web our first main result characterizes when the parallel trends assumption is invariant to transformations.