Difference-in-Difference Estimation | Columbia Public Health
https://www.publichealth.columbia.edu/research/population-health-methods/difference-difference-estimation
WEBDifference-in-Difference estimation, graphical explanation. DID is used in observational settings where exchangeability cannot be assumed between the treatment and control groups. DID relies on a less strict exchangeability assumption, i.e., in absence of treatment, the unobserved differences between treatment and control groups arethe same ...
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