{"kind":"assistant","text":"IV2SLS.from_formula('DemShareDB_res ~ HomeDB_res + [DemShareGOV_res ~ HomeGOV_res]'), clustered by fips; the columns are residualised, so the tool's constant is zero and the fit equals the script's no-constant model","tool_calls":[{"args":{"cluster":"fips","dataset":"ref_iv","endog":["DemShareGOV_res"],"exog":["HomeDB_res"],"instruments":["HomeGOV_res"],"y":"DemShareDB_res"},"id":"script_1","name":"infer__iv_2sls"}]}