WP by @nmoreaukastler.bsky.social on how to estimate proportional treatment effects with staggered timing using PPML.
🔹TWFE PPML can be biased with treatment heterogeneity & staggered adoption.
🔹Proposing a counterfactual method to recover the correct % change.
https://www.taxobservatory.eu/publication/proportional-treatment-effects-in-staggered-settings-an-approach-for-poisson-pseudo-maximum-likelihood/