{
  "task_id": "F1-conf-01",
  "first_growth_month": "2001-01",
  "last_month": "2026-09",
  "n_months_growth": 308,
  "n_months_missing_growth": 1,
  "n_analysed": 308,
  "mean_growth_12m": 2.57412,
  "mean_growth_12m_2001_2013": 2.361215,
  "mean_growth_12m_2014_2026": 2.792628,
  "growth_2014_06": 2.097634,
  "growth_2016_07": 0.868363,
  "growth_2020_05": 0.198201,
  "growth_2022_06": 8.979361,
  "growth_2026_09": 3.717251,
  "max_growth_12m": 8.979361,
  "max_growth_month": "2022-06",
  "min_growth_12m": -1.958761,
  "min_growth_month": "2009-07",
  "feasibility": "partial",
  "feasibility_reason": "g_t not computable for ['2025-10']: the 2026-10-28 vintage reports no CPI value for 2025-10 and imputation is not allowed. All other window months and all summary statistics are computed (means over available months).",
  "data_issues": [
    {
      "issue": "cpi_vintage_2026-10-28.csv: no CPI value reported for 2025-10 (empty cell)",
      "handling": "Treated as missing; not interpolated or imputed. No value exists in the older vintage either (it ends 2016-06), so the index level for this month is missing and g_t for this month (and for t+12, which lies outside the window) cannot be computed."
    },
    {
      "issue": "Vintages overlap for 30 months (2014-01..2016-06) and disagree (revisions incl. seasonal-factor updates): new-old ranges -0.455 to 0.330 index points.",
      "handling": "Per the availability rule the 2026-10-28 value is used for every overlapping month. Consequently g_t for 2014-01..2014-12 divides a 2026-vintage level by a 2016-vintage level (2013 months exist only in the old extract); this cross-vintage mixing is flagged in the report."
    },
    {
      "issue": "cpi_assembled.csv uses the 2016-07-15 vintage for 30 overlapping months 2014-01..2016-06 instead of the most recent (2026-10-28) vintage.",
      "handling": "Assembled file not used; levels rebuilt from the two vintage files."
    },
    {
      "issue": "cpi_assembled.csv lacks month(s) ['2016-07'] and contains month(s) beyond the sources ['2026-10']: after the dropped month the 2026-vintage values are shifted one month later (off-by-one dating).",
      "handling": "Assembled file not used; levels rebuilt from the two vintage files."
    },
    {
      "issue": "cpi_assembled.csv values disagree with the authoritative splice in 152 of 956 common months.",
      "handling": "Assembled file treated as unreliable and used only for this audit."
    }
  ],
  "n_input_rows": {
    "cpi_vintage_2016-07-15.csv": 834,
    "cpi_vintage_2026-10-28.csv": 153,
    "cpi_assembled.csv": 957
  },
  "random_seed": null,
  "sensitivity_mean_growth_2014_mixed_vintage": 1.611653,
  "sensitivity_mean_growth_2014_old_vintage_only": 1.611352,
  "sensitivity_growth_2014_06_old_vintage_only": 2.005104
}