{
  "report": "TSR-SPS-KCS-20260906-v1",
  "issued_date": "2026-09-06",
  "review_status": "Draft worked example · source-checked · final founder review and approval outstanding. This is not a signed client report.",
  "inputs": [
    {
      "year": 2022,
      "stPauls": "70",
      "kcs": "68.1",
      "difference": "1.9",
      "stPaulsSource": "https://www.stpaulsschool.org.uk/academic/academic-13-16/exam-results-information/a-level-and-pre-u-results/",
      "kcsSource": "https://www.kcs.org.uk/media/13455/a-level_2025.pdf",
      "stPaulsRecord": "fig:st_pauls_alevel:26",
      "kcsRecord": "fig:kcs_alevel_only:13",
      "stPaulsVersion": "2025 results page checked 2026-09-06",
      "kcsVersion": "2025 PDF retrospective",
      "frozenStPauls": "70.9",
      "frozenDifference": "2.8"
    },
    {
      "year": 2023,
      "stPauls": "51",
      "kcs": "50.3",
      "difference": "0.7",
      "stPaulsSource": "https://www.stpaulsschool.org.uk/academic/academic-13-16/exam-results-information/a-level-and-pre-u-results/",
      "kcsSource": "https://www.kcs.org.uk/media/13455/a-level_2025.pdf",
      "stPaulsRecord": "fig:st_pauls_alevel:27",
      "kcsRecord": "fig:kcs_alevel_only:14",
      "stPaulsVersion": "2025 results page checked 2026-09-06",
      "kcsVersion": "2025 PDF retrospective",
      "frozenStPauls": "50.6",
      "frozenDifference": "0.3"
    },
    {
      "year": 2024,
      "stPauls": "61",
      "kcs": "50.70",
      "difference": "10.30",
      "stPaulsSource": "https://www.stpaulsschool.org.uk/academic/academic-13-16/exam-results-information/a-level-and-pre-u-results/",
      "kcsSource": "https://www.kcs.org.uk/media/13455/a-level_2025.pdf",
      "stPaulsRecord": "fig:st_pauls_alevel:28",
      "kcsRecord": "fig:kcs_alevel_only:15",
      "stPaulsVersion": "2025 results page checked 2026-09-06",
      "kcsVersion": "2025 PDF retrospective",
      "frozenStPauls": "60.2",
      "frozenDifference": "9.50"
    },
    {
      "year": 2025,
      "stPauls": "59.3",
      "kcs": "50.75",
      "difference": "8.55",
      "stPaulsSource": "https://www.stpaulsschool.org.uk/academic/academic-13-16/exam-results-information/a-level-and-pre-u-results/",
      "kcsSource": "https://www.kcs.org.uk/media/13455/a-level_2025.pdf",
      "stPaulsRecord": "fig:st_pauls_alevel:29",
      "kcsRecord": "fig:kcs_alevel_only:16",
      "stPaulsVersion": "2025 results page checked 2026-09-06",
      "kcsVersion": "2025 PDF retrospective",
      "frozenStPauls": "59.3",
      "frozenDifference": "8.55"
    }
  ],
  "source_versions": [
    {
      "id": "SPS-2022-ASTAR",
      "schoolId": "st-pauls",
      "year": 2022,
      "field": "a_star",
      "variants": [
        {
          "value": "70.9",
          "location": "fig:st_pauls_alevel:26",
          "original_checked": false
        },
        {
          "value": "70",
          "url": "https://www.stpaulsschool.org.uk/academic/academic-13-16/exam-results-information/a-level-and-pre-u-results/",
          "original_checked": true
        }
      ],
      "cause": "Unresolved; no dated amendment or matching original precision recovered in this bounded check.",
      "accepted_version": null,
      "action": "Locate original detailed 2022 table; do not assume ordinary rounding or overwrite the frozen value."
    },
    {
      "id": "SPS-2024-ASTAR",
      "schoolId": "st-pauls",
      "year": 2024,
      "field": "a_star",
      "variants": [
        {
          "value": "60.2",
          "location": "fig:st_pauls_alevel:28",
          "original_checked": false
        },
        {
          "value": "61",
          "url": "https://www.stpaulsschool.org.uk/academic/academic-13-16/exam-results-information/a-level-and-pre-u-results/",
          "original_checked": true
        }
      ],
      "cause": "Unresolved; current summary differs from frozen precise figure.",
      "accepted_version": null,
      "action": "Locate dated detailed 2024 table and any revision statement."
    },
    {
      "id": "KCS-2023-ASTAR",
      "schoolId": "kcs",
      "year": 2023,
      "field": "a_star",
      "variants": [
        {
          "value": "50.1",
          "url": "https://www.kcs.org.uk/media/8937/a-level-results-2023.pdf",
          "original_checked": true
        },
        {
          "value": "50.1",
          "url": "https://www.kcs.org.uk/media/11056/a-level-results-2024.pdf",
          "original_checked": true
        },
        {
          "value": "50.3",
          "url": "https://www.kcs.org.uk/media/13455/a-level_2025.pdf",
          "original_checked": true
        }
      ],
      "cause": "Unresolved. 2023 detailed table gives 288 A* of 575 entries; 2025 retrospective gives 50.3 without amended counts.",
      "accepted_version": null,
      "action": "Retain both; ask school about revised counts only after owner approval if required."
    },
    {
      "id": "SPS-2025-ASTAR",
      "schoolId": "st-pauls",
      "year": 2025,
      "field": "a_star",
      "variants": [
        {
          "value": "57",
          "url": "https://www.stpaulsschool.org.uk/a-level-results-2025/",
          "publication_date": "2025-08-14",
          "original_checked": true
        },
        {
          "value": "59.3",
          "url": "https://www.stpaulsschool.org.uk/academic/academic-13-16/exam-results-information/a-level-and-pre-u-results/",
          "publication_date": null,
          "original_checked": true
        }
      ],
      "cause": "Results-day news and current detailed result page differ; a revision explanation was not established.",
      "accepted_version": null,
      "action": "Use the explicitly named current 2025 results-page version for this descriptive example; do not assert a proven re-mark cause."
    }
  ],
  "formula": "For each year: published St Paul A* percent minus published KCS A* percent. Median = average of the middle two sorted differences. No pupil/entry weighting.",
  "outputs": {
    "median_pp": "5.225",
    "frozen_unverified_context_median_pp": "5.675",
    "matched_years": 4,
    "robustness": "Insufficient evidence"
  },
  "original_corpus_sha256": "245f2d8176f8fca0d53f41689f096734dd13e9023af9a67931314334251b9f6f",
  "original_source_file_sha256": {
    "st-pauls-2025-destinations.pdf": "7ef57d57e2dcddf50861ce4a9fb40b7ac7251173b23bee219267897682228468",
    "kcs-2024.pdf": "2c84ae7cbd235bcb069ce52164fbfb65527fa35738f68f1abd9f4cca0b574ac8",
    "kcs-2023.pdf": "37eeb33c3fa920865f00f0afa02c7c6a1ab48fdcd08a65cd0dbfe2b3fa358469",
    "kcs-2025.pdf": "da195058cce30ab434fff7dd8d7cd5afe4442e19424daf82953cb8e09a52d5e3"
  },
  "source_check_date": "2026-09-06",
  "source_version_policy": "No variant is overwritten; no cause of discrepancies is assumed; report inputs remain fixed if the site later changes."
}