{"kind":"assistant","text":"sm.OLS(turnout, add_constant([treated_group, post, did, post_x_*_pre]), missing='drop').fit(cov_type='cluster', groups=fips) (CR1 errors with statsmodels' default G/(G-1)\u00b7(N-1)/(N-K) correction)","tool_calls":[{"args":{"cluster":"fips","controls":["treated_group","post","post_x_perc_bl_pre","post_x_pop_tot_pre","post_x_income_pre"],"dataset":"ref_panel","x":["did"],"y":"turnout"},"id":"script_1","name":"infer__ols"}]}