{
  "apiVersion": "v0.1",
  "methodology": "https://sourcescore.org/methodology/modern-reference/",
  "canonical": "https://sourcescore.org/compare/nature-vs-pnas/modern-reference/",
  "summary": "Two top multidisciplinary peer-reviewed journals — Nature commercial; PNAS NAS-affiliated open-access.",
  "dimension": {
    "key": "modernReference",
    "pathSegment": "modern-reference",
    "label": "Modern Citation Reference",
    "weightInComposite": "30%"
  },
  "a": {
    "slug": "nature",
    "name": "Nature",
    "domain": "nature.com",
    "category": "Academic",
    "canonical": "https://sourcescore.org/source/nature/",
    "api": "https://sourcescore.org/api/source/nature.json",
    "dimensionDetail": "https://sourcescore.org/modern-reference/nature/",
    "dimensionDetailApi": "https://sourcescore.org/api/modern-reference/nature.json",
    "score": {
      "value": 85,
      "grade": "A",
      "rationale": "DOIs are first-class citations in LLM training; abstracts well-indexed.",
      "signals": [
        {
          "label": "DOI",
          "detail": "Permanent identifier per article; resolves at doi.org."
        }
      ]
    },
    "rank": {
      "global": 57,
      "globalTotal": 130
    }
  },
  "b": {
    "slug": "pnas",
    "name": "PNAS",
    "domain": "pnas.org",
    "category": "Academic",
    "canonical": "https://sourcescore.org/source/pnas/",
    "api": "https://sourcescore.org/api/source/pnas.json",
    "dimensionDetail": "https://sourcescore.org/modern-reference/pnas/",
    "dimensionDetailApi": "https://sourcescore.org/api/modern-reference/pnas.json",
    "score": {
      "value": 88,
      "grade": "A",
      "rationale": "DOI per paper; PMC open-access default after 6mo; structured Crossref + ORCID metadata.",
      "signals": [
        {
          "label": "Open-access policy",
          "detail": "All content open after 6-month embargo; many papers immediately open."
        }
      ]
    },
    "rank": {
      "global": 40,
      "globalTotal": 130
    }
  },
  "verdict": {
    "winner": "pnas",
    "delta": 3,
    "claim": "PNAS outscores Nature on Modern Citation Reference by 3 points."
  },
  "otherDimensions": [
    {
      "pathSegment": "discipline",
      "label": "Citation Discipline",
      "canonical": "https://sourcescore.org/compare/nature-vs-pnas/discipline/",
      "api": "https://sourcescore.org/api/compare/nature-vs-pnas/discipline.json"
    },
    {
      "pathSegment": "velocity",
      "label": "Citation Velocity",
      "canonical": "https://sourcescore.org/compare/nature-vs-pnas/velocity/",
      "api": "https://sourcescore.org/api/compare/nature-vs-pnas/velocity.json"
    },
    {
      "pathSegment": "index",
      "label": "SourceScore Index (composite)",
      "canonical": "https://sourcescore.org/compare/nature-vs-pnas/",
      "api": "https://sourcescore.org/api/compare/nature-vs-pnas.json"
    }
  ],
  "license": {
    "methodology": "Cite as: SourceScore Methodology v0.1, sourcescore.org",
    "data": "Underlying public-source data credited to original publishers"
  }
}