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Submitted by Austin Nichols on

No mention of spillovers or network effects or violations of the stable unit treatment value assumption? A common flaw in all these designs is failure to account for general equilibrium impacts. Also, there is no such thing as a control group--there are only alternative treatment groups and one can hope to create an arm that is as close to "usual care" as possible but one needs to study implementation in that arm to see if the supposed non-intervention or placebo is in fact close to that "usual care" target.