{
  "study": "portugal-library-monograph-lending-and-additions-2024",
  "original_opportunity": "pt-04",
  "observation_year": 2024,
  "unit": "municipal RNBP reporting service, not individual building",
  "source_url": "https://dados.gov.pt/en/datasets/dados-estatisticos-da-rede-nacional-de-bibliotecas-publicas-2024",
  "report_url": "https://bibliotecas.dglab.gov.pt/pt/ServProf/Estatistica/Documents/QE2024_Relatorio.pdf",
  "stock_question": "3.1.1, monograph copies at 31 December 2024",
  "additions_question": "4.1.1, monograph acquisitions during 2024, including purchases/offers/donations/exchanges",
  "loans_question": "8.1.1, home-loaned monographs",
  "numeric_source_columns_zero_based": {
    "population": 3,
    "stock": 17,
    "additions": 27,
    "loans": 60
  },
  "encoding": "official CSV cp1252, semicolon-separated, two header rows after title row",
  "sample_rule": "257 source rows with year2024; require all three monograph measures and positive stock, no imputation; retain recorded zeros",
  "formula_loans": "loaned_monographs / stock_monographs",
  "formula_additions": "acquired_monographs / stock_monographs",
  "median_rule": "loans strictly greater than median and additions strictly less than median in same analysis group",
  "quartile_rule": "loans > inclusive interpolated Q75 and additions < inclusive interpolated Q25",
  "bands": [
    "population<25000",
    "25000<=population<=50000",
    "population>50000"
  ],
  "source_population_note": "Use supplied population as size proxy only. Report introduction identifies provisional 2024 resident estimates; later paragraph inconsistently references Censos2024; not independently reconciled.",
  "no_claims": [
    "causation",
    "shortages",
    "underfunding",
    "unique readers",
    "newly published books",
    "all Portuguese libraries",
    "average inventory turnover",
    "net collection growth"
  ],
  "credit": "Direção-Geral do Livro, dos Arquivos e das Bibliotecas (DGLAB), Estatística RNBP 2024, CSV resource updated 14 April 2026, retrieved 30 October 2026. Source data: CC BY 4.0. Original secondary analysis and explanation: Alisson Bento. Changes: selected monograph fields, matched complete cases, stock-normalized ratios, population bands and threshold sensitivity. No endorsement by DGLAB is implied."
}