Twfe
2 articles
When the parallel-trends test fails on one lead, what's left?
Replicating Wang et al. (2026) TWFE-DiD on SNAP BBCE adoption from IPUMS ACS, with Goodman-Bacon decomposition and leave-one-out diagnostics.
When the parallel-trends test fails on one lead, what's left?
A TWFE difference-in-differences design where the pre-period F-test rejects parallel trends on one lead. Walk through the rest of the diagnostic stack on SNAP BBCE adoption.