1{2 "task_id": "F1-conf-01",3 "first_growth_month": "2001-01",4 "last_month": "2026-09",5 "n_months_growth": 308,6 "n_months_missing_growth": 1,7 "n_analysed": 308,8 "mean_growth_12m": 2.5741201900729784,9 "mean_growth_12m_2001_2013": 2.3612153974326064,10 "mean_growth_12m_2014_2026": 2.7926277404144115,11 "growth_2014_06": 2.0976342438575157,12 "growth_2016_07": 0.8683633430518256,13 "growth_2020_05": 0.1982013035848551,14 "growth_2022_06": 8.979361103105798,15 "growth_2026_09": 3.7172508442689933,16 "max_growth_12m": 8.979361103105798,17 "max_growth_month": "2022-06",18 "min_growth_12m": -1.9587610037622771,19 "min_growth_month": "2009-07",20 "feasibility": "partial",21 "feasibility_reason": "1 of 309 window months have no computable 12-month growth rate (2025-10) because the source reports no index level; per the task rules they are not imputed. All window means are over the remaining months; all named months are computable.",22 "data_issues": [23 {24 "issue": "Vintage 2026-10-28 reports no CPI value for 2025-10 (empty cell).",25 "handling": "Not imputed; g_t for that month (and for month+12 if inside the window) reported missing and counted."26 },27 {28 "issue": "The two vintages overlap for 30 months (2014-01..2016-06) with different values (revisions of seasonal factors; new-old ranges -0.455..0.330 index points).",29 "handling": "Per the availability rule the 2026-10-28 value is used for 2014-01 onward; 2016-07-15 values only before 2014-01. Hence g_t for 2014-01..2014-12 divides a 2026-vintage level by a 2016-vintage level (mixed-vintage ratio); noted as a limitation."30 },31 {32 "issue": "cpi_assembled.csv uses 2016-07-15 vintage values for 30 months (2014-01..2016-06) that the 2026-10-28 vintage covers, violating the most-recent-vintage rule.",33 "handling": "Assembled file not used for estimation; series re-built from the two vintage files."34 },35 {36 "issue": "cpi_assembled.csv is missing month(s) 2016-07 and contains month(s) 2026-10 not present in any source; from 2016-08 onward 123 of 123 values equal the source value of the previous month (one-month date shift). In total 152 common months have values differing from the authoritative splice.",37 "handling": "Assembled file treated as unreliable and used only for this audit; all estimates come from the vintage files."38 },39 {40 "issue": "SHA-256 values in data/README.md refer to the raw downloads, not to the reformatted CSV files in data/, so they cannot be used to verify the files.",41 "handling": "Recorded the SHA-256 of the files as received in out/state/data_audit.md; no further action."42 }43 ],44 "n_input_rows": {45 "cpi_vintage_2016-07-15.csv": 834,46 "cpi_vintage_2026-10-28.csv": 153,47 "cpi_assembled.csv": 95748 },49 "random_seed": null,50 "n_months_window": 309,51 "missing_growth_months": [52 "2025-10"53 ],54 "n_months_growth_2001_2013": 156,55 "n_months_growth_2014_2026": 152,56 "sd_growth_12m": 1.7407883258999681,57 "max_abs_vintage_revision_overlap": 0.4550000000000125,58 "sens_mean_growth_201401_201606_old_vintage": 0.9069521485742471,59 "sens_mean_growth_201401_201606_rule": 0.9032230102017299,60 "sens_max_abs_diff_growth_201401_201606": 0.1273317356130121461}