Intuitively, shouldn't we take into account the fact that different groups may influence each other during the time period? Common trend assumption may not hold while later-adoption groups and never-adoption groups under pressure of early-adoption groups?
Good point. An important assumption is called SUTVA, which basically states that there are no spillovers. Spillovers can lead to biased estimates; problem is that they are hard to deal with.
These videos have been a wonderful resource in helping with my read of Causal Inference: The Mixtape. Thanks for posting these!
Terrific. This is great sources and you are a wonderful instructor!
Great video! Thanks!
Intuitively, shouldn't we take into account the fact that different groups may influence each other during the time period? Common trend assumption may not hold while later-adoption groups and never-adoption groups under pressure of early-adoption groups?
Good point. An important assumption is called SUTVA, which basically states that there are no spillovers. Spillovers can lead to biased estimates; problem is that they are hard to deal with.
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