3 papers
econ.EM2026
Improved Inference for CSDID Using the Cluster Jackknife
Sunny R. Karim, Morten Ãrregaard Nielsen, James G. MacKinnon +1
Obtaining reliable inferences with traditional difference-in-differences (DiD) methods can be difficult. Problems can arise when both outcomes and errors are serially correlated, w…
econ.EM2025
Good Controls Gone Bad: Difference-in-Differences with Covariates
Sunny Karim, Matthew D. Webb
This paper introduces the two-way common causal covariates (CCC) assumption, which is necessary to get an unbiased estimate of the ATT when using time-varying covariates in existin…
econ.EM2025
Difference-in-Differences with Unpoolable Data
Sunny Karim, Matthew D. Webb, Nichole Austin +1
Difference-in-differences (DID) is commonly used to estimate treatment effects but is infeasible in settings where data are unpoolable due to privacy concerns or legal restrictions…