{"kind":"assistant","text":"sm.OLS(y, add_constant([group_treated, post, g_post])).fit(cov_type='cluster', groups=bfs) (CR1 errors with statsmodels' default G/(G-1)\u00b7(N-1)/(N-K) correction)","tool_calls":[{"args":{"cluster":"bfs","controls":["group_treated","post"],"dataset":"ref_panel","x":["g_post"],"y":"nat_rate_ord"},"id":"script_1","name":"infer__ols"}]}