1{2 "task_id": "F6-conf-03",3 "feasibility": "complete",4 "feasibility_reason": null,5 "data_issues": [6 {7 "issue": "UNRATE missing for month(s) 2025-10",8 "handling": "Outside the 1959Q4-2019Q4 window needed for estimation; quarter would be incomplete and is not used. No imputation."9 },10 {11 "issue": "GDPC1 is the current (2026) vintage in chained 2017 dollars, not real-time data; historical growth rates reflect later revisions.",12 "handling": "Used as provided (the task specifies this series); noted as a limitation."13 }14 ],15 "n_input_rows": {16 "GDPC1.csv": 319,17 "UNRATE.csv": 94518 },19 "n_analysed": 240,20 "random_seed": null,21 "sample_start": "1960-01-01",22 "sample_end": "2019-10-01",23 "n_sub1": 96,24 "n_sub2": 144,25 "baseline_metric": 0.32465793964999184,26 "model_metric": 0.2497438816636253,27 "effect_estimate": -0.2557677277487258,28 "intercept": 0.18438835418210714,29 "effect_se": 0.03583463330296569,30 "hac_lags": 4,31 "effect_ci_low": -0.32600231842173816,32 "effect_ci_high": -0.18553313707571345,33 "beta_sub1": -0.25902105345680587,34 "beta_sub2": -0.27339263306757905,35 "chow_f_stat": 6.0903330062337675,36 "chow_p_value": 0.002636323851733417,37 "stability_conclusion": "unstable",38 "conclusion": "negative_effect",39 "ols_iid_se": 0.01996009291490984,40 "r_squared": 0.4082508284562034,41 "intercept_sub1": 0.2542326539884382,42 "intercept_sub2": 0.15168581347724602,43 "se_hac_sub1": 0.03928680828959863,44 "se_hac_sub2": 0.06831428793738023,45 "hac_se_by_lag": {46 "0": 0.028836223207269963,47 "2": 0.03422732023615383,48 "4": 0.03583463330296569,49 "8": 0.03713550417540189,50 "12": 0.036408851102280951 },52 "hac_wald_break_chi2": 10.926210056989923,53 "hac_wald_break_p": 0.004240368816511458,54 "hac_p_intercept_diff": 0.24996972549597873,55 "hac_p_slope_diff": 0.8536158012976183,56 "resid_var_ratio_sub1_sub2": 1.6261064345399512,57 "chow_df": [58 2,59 23660 ]61}