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Guide to DID estimators
This guide illustrates scenarios in which difference in differences (DID)
analysis can be applied. The goal is to illustrate when the usual two way fixed effects (TWFE) method of estimation provides suitable results and when the TWFE approach is biased. In the latter case, we show alternative methods to estimation to overcome the issue.
Drug overdose mortality by US State, 1979-2015
US State Trends in drug overdoses since 1979.