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Good Controls Gone Bad: Difference-in-Differences with Covariates

Karim, Sunny et al.
arXiv (All) · Papers
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econometrics
This paper introduces the common causality of covariates (CCC) assumption in difference-in-differences with covariates. This assumption stipulates that covariates must have common effects on untreated potential outcomes across regions and periods. We also introduce Integrated Parallel Trends, a weak
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