A doubly randomized permutation test for the DiD coefficient maintains correct empirical size in small samples where HC0 and CRVE1 t-tests are substantially anti-conservative.
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Testing the Significance of the Difference-in-Differences Coefficient via Doubly Randomised Inference
A doubly randomized permutation test for the DiD coefficient maintains correct empirical size in small samples where HC0 and CRVE1 t-tests are substantially anti-conservative.