{
  "author": "Alisson Bento",
  "geography": "England, resident people aged 16+; LAD25 is respondent residence, not library authority performance.",
  "fieldwork": "2025-04-01/2026-03-31",
  "recall": "Reported engagement in the preceding 12 months, not an administrative visit total during fieldwork.",
  "survey_combination": "Participation April–September 2025 plus Community and Engagement Survey October 2025–March 2026; much larger latter sample.",
  "questionnaire_limitation": "Workbook Note 11: library questions were erroneously omitted from the Community paper questionnaire, reducing question bases and leaving possible mode/nonresponse bias beyond sampling intervals.",
  "unit": "295 paired usable districts, 590 mode rows; medians weight each district equally.",
  "width": "Published upper95_pct minus lower95_pct, in percentage points. Source D:F values already express percentages; never multiply by 100.",
  "source_sha256": "98298225d25ff0ac08c6c5f5e4f1bbbab5ed4b459dab55094de9fb04c8ccc33e",
  "source_plan_sha256": "9a218acf41d398fe52a84cf685a1be498fe09973acf4c55ba31dc88f94467610",
  "suppression": "Isles of Scilly source c flags and base 21 retained in exclusion file; not converted to zero.",
  "interval_containment": "Geometry only, not a significance or equivalence test. National and local estimates are not independent.",
  "dates": "Annual release 31 July 2026; detailed reports 14 August; narrative correction 22 October did not change source tables.",
  "reproduction": "Copy downloads to a separate working folder. Put the exact frozen official workbook at sources/libraries-2025-26.ods. Run python inspect-ods.py then python analysis.py. Python standard library only; source hash checked by analysis. Inspector exports only K3/K6, not third-party Acorn fields. Original raw workbook is not rehosted.",
  "rights": "Contains public sector information licensed under the Open Government Licence v 3.0. Source: DCMS Community and Engagement Survey 2025/26. Calculations and presentation: Alisson Bento.",
  "limitations": [
    "Published widths describe sampling precision, not accuracy, bias, service quality or resident-level error.",
    "Physical engagement includes home/outreach; digital includes broad services and telephone.",
    "No cross-year trend, best/worst service rank, population count or new national survey estimate."
  ]
}