{
  "schema_version": 1,
  "predeclared_at_utc": "2026-10-28T21:57:25Z",
  "status": "source_gate_passed_for_within_year_descriptive_precision_audit",
  "reader_question": "How much wider are England's council-level library-use estimates than its national estimates, and how often do local95% intervals span the national point estimate?",
  "prior_overlap": {
    "EN08": "England nonuser barriers; different question and denominator.",
    "live_families": "No existing England local-authority uncertainty audit found among the seven live study families.",
    "novelty": "Original secondary calculation and a more usable presentation of official cells; no first-ever or new-survey claim."
  },
  "source": {
    "publisher": "Department for Digital, Culture, Media and Sport; Department for Culture, Media and Sport; Ministry of Housing, Communities and Local Government",
    "annual_release": "2025/26",
    "source_url": "https://www.gov.uk/government/statistics/community-and-engagement-survey-202526-libraries",
    "source_ods_sha256": "98298225d25ff0ac08c6c5f5e4f1bbbab5ed4b459dab55094de9fb04c8ccc33e",
    "sheets": [
      "K3",
      "K6"
    ],
    "current_columns": "D:H (2025/26). Prior-year I:M must not enter calculations.",
    "source_flags": "c=suppressed, x=unavailable, N/A=not applicable; never recode to zero.",
    "source_ci": "Published95% confidence limits. Technical report says survey::svyciprop logit method."
  },
  "scope": {
    "geography": "England only, not whole UK",
    "population": "People aged16+ in the survey's residential address/private-household frame.",
    "observation": "Responses collectedApril2025–March2026 about use during the preceding12months; headline data combineParticipationApr–Sep2025 with much larger CESOct2025–Mar2026.",
    "publication": "31July2026; narrativeupdated22October2026, data tables unchanged per publisher update.",
    "geography_unit": "One2025local-authority district code, not a library building/system or a person.",
    "missingness_note": "Library questions were omitted from the2025/26 Community paper questionnaire in error (workbookNote11). Published bases are lower than for other cultural sectors; preserve this limitation."
  },
  "analysis_rules": [
    "Identify district rows by valid LAD25 code in sourcecolumnN; keep names and ITL1/ITL2 geography from same row. Exclude the national total row, not a district.",
    "Use published unrounded numeric values from sourcecolumnsD,E,F; preserve lower/point/upper and unweighted count/base G,H. Never recompute weighted rates by count/base.",
    "Join modes one-to-one by district code and report unmatched/suppressed/invalid rows explicitly.",
    "Compute each source95% interval width as upper minus lower in percentage points.",
    "For each mode, summarize number of usable districts, unweighted median/min/max interval width, and national interval width from the matching total row.",
    "Report width bins [0,5),[5,10),[10,15),[15,20),[20,infinity) percentage points. Thresholds are descriptive display bins, not standards of statistical quality.",
    "Count districts whose source lower<=national point<=source upper. This is a descriptive containment measure, not a significance test, equivalence statement or proof of no difference.",
    "No difference confidence interval, independent-sample test, CI-overlap test, local-authority rank inference, causal claim or cross-year comparison.",
    "Summaries weight each district equally; they describe the set of published district estimates and are not percentages of England residents.",
    "Choose illustrative forest-chart districts by minimum, median and maximum unweighted base (tie break code), before inspecting extreme estimates. Show source intervals separately by mode."
  ],
  "licence": {
    "status": "OGL v3.0 explicitly declared in official report and GOV.UK terms; no contrary restriction on selected K3/K6 government estimates identified.",
    "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: DCMS Community and Engagement Survey2025/26. Calculations and presentation: Alisson Bento.",
    "third_party_exclusion": "Do not extract/reproduce Acorn demographic values or third-partylogos. Clean derived tables use government district estimates and official geography only.",
    "licence_page_access": "NationalArchives link returned403inwebtool; do not bypass. Officialreport's actual OGL declaration and GOV.UK reproduction terms captured."
  },
  "planned_outputs": [
    "Complete clean295-or-actual-count district/mode CSV with source cells and95% intervals",
    "Descriptive summary CSV/JSON and complete HTML-ready table",
    "2–3 originalSVG chart concepts using source intervals/derived widths",
    "English scientific brief with definitions, actual precision, limitations and reusable source attribution"
  ],
  "public_site_mutation": false,
  "emails_or_permissions_requests": false
}