{
  "schemaVersion": 1,
  "id": "https://www.crosstabs.com/examples/snoring-and-heart-disease#dataset",
  "version": "1.0.0",
  "name": "Snoring and Heart Disease",
  "description": "An epidemiological survey of 2,484 adults relating snoring frequency to heart disease — a standard ordinal-by-binary example from Agresti.",
  "field": "public health",
  "question": "Was snoring frequency associated with heart disease?",
  "takeaway": "Heart-disease prevalence rose with snoring frequency, but the observational table cannot establish causation.",
  "datePublished": "2026-06-10",
  "dateModified": "2026-07-31",
  "provenance": {
    "kind": "derived",
    "citation": "Norton, P. G., & Dunn, E. V. (1985). Snoring as a risk factor for disease. British Medical Journal, 291, 630–632. Reproduced in Agresti, A., Categorical Data Analysis.",
    "sourceUrl": "https://www.bmj.com/content/291/6496/630"
  },
  "variables": {
    "row": {
      "name": "Snoring frequency",
      "categories": [
        "Never snores",
        "Occasional",
        "Nearly every night",
        "Every night"
      ]
    },
    "column": {
      "name": "Heart disease",
      "categories": [
        "Heart disease",
        "No heart disease"
      ]
    }
  },
  "counts": [
    [
      24,
      1355
    ],
    [
      35,
      603
    ],
    [
      21,
      192
    ],
    [
      30,
      224
    ]
  ]
}