{
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  "item": {
    "id": "METHOD-0277",
    "kind": "METHOD",
    "title": "pandasで区分ごとの件数と複数の統計を計算する",
    "last_verified": "2026-10-23",
    "currentness": "VERIFIED_AS_OF",
    "revision": 1,
    "requirements": [
      "対象データへの権限",
      "接続先または入力ファイルを確認する",
      "原典と導入済みversionの対応を確認し、権限のある検証用入力・別の出力先を用意する"
    ],
    "suitable_for": "区分別の集計表をPythonで再現する場面。",
    "unsuitable_for": "集計の単位が異なる数値を無条件に足す用途。",
    "purpose": "pandasで区分ごとの件数と複数の統計を計算する",
    "composition": "pandas + Python",
    "shortest_path": [
      "区分列と計算対象の数値列を決める",
      "groupbyとaggで件数・合計などを求める",
      "区分の欠損と集計前後の合計を照合する"
    ],
    "verification": "小さな手計算例で件数・NULLの扱い・出力列を確認します。",
    "coverage": [
      "data transformation"
    ],
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