Selection on Y(0) and Parallel Trends: Anticipating Step (4) in Pedro's Diff-in-Diff Checklist
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People select into a treatment based on any number of reasons. For instance, they could end up taking a polio vaccine because they were in a study where the polio vaccine was randomized, which is similar to saying they were assigned to the treatment because of
Selection on Y(0) and Parallel Trends: Anticipating Step (4) in Pedro's Diff-in-Diff Checklist
Selection on Y(0) and Parallel Trends…
Selection on Y(0) and Parallel Trends: Anticipating Step (4) in Pedro's Diff-in-Diff Checklist
People select into a treatment based on any number of reasons. For instance, they could end up taking a polio vaccine because they were in a study where the polio vaccine was randomized, which is similar to saying they were assigned to the treatment because of