{
  "dataset": "TIMSS 2019 (IEA)",
  "source": "https://timssandpirls.bc.edu/timss2019/international-database/",
  "access": "FREE but requires website navigation to download",
  "scale": "300-500K students, 150-200 items per subject, 60+ countries",
  "files": {
    "BSA*.sav (Achievement)": {
      "IDCNTRY": "Country",
      "IDSTUD": "Student",
      "IDBOOK": "Booklet",
      "M071001...": "Math item scores (0/1/2/6/7/8/9)"
    },
    "BSG*.sav (Background)": {
      "ITSEX": "Gender (1=Girl,2=Boy)",
      "BSBG04": "Books at home (SES proxy)",
      "BSDGLCNT": "Language at home"
    }
  },
  "has_demographics": true,
  "has_item_responses": true,
  "has_selected_answer": false,
  "has_question_text": "PARTIAL ~30-50% in separate PDFs only"
}