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      "xlabel": "Miscoverage target alpha",
      "ylabel": "Conservative rank fraction",
      "logx": false,
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  ],
  "title": "Finite calibration samples impose rank granularity",
  "assumptions": "Exchangeable scores, split calibration, conservative tie handling. Rank n+1 means infinite threshold/full set. Fractions are not measured coverage.",
  "worked": "α=0.05时，n=19取第19秩；n=99取第95秩。若n=19且α=0.01，k=20超过样本数，应采取无穷阈值或全集等保守处理。",
  "source_ids": [
    "arxiv-2107.07511",
    "arxiv-1905.03222",
    "helm"
  ],
  "formula_source": "Article equations and this versioned script",
  "diagram_nodes": [
    "冻结预测器与分数",
    "独立校准集",
    "有限样本秩阈值",
    "构造预测集合",
    "覆盖及大小联合评估",
    "子群 / 时间 / 分布变化监测"
  ]
}