{
  "report_id": "HDN-NYSE-STOCK-20261022",
  "title": "Historical Stock Data Quality Report: Comparison with NYSE Daily TAQ",
  "language": "en",
  "status": "published",
  "claims": [
    {
      "id": "D_OPEN",
      "statement": "For the mapped 1 July 2026 sample, 10,896 of 10,917 comparable daily open values (99.8076%) matched the documented NYSE Daily TAQ reconstruction exactly.",
      "numerator": 10896,
      "denominator": 10917,
      "percent": 99.807639,
      "field": "open",
      "evidence": [
        "results.json#/daily/fields/open"
      ],
      "sources": [
        "S1",
        "S2",
        "S4",
        "S5",
        "S6"
      ],
      "limit": "Sample field concordance with a reconstruction; not archive-wide accuracy or exchange endorsement."
    },
    {
      "id": "D_HIGH",
      "statement": "For the mapped 1 July 2026 sample, 10,872 of 10,917 comparable daily high values (99.5878%) matched the documented NYSE Daily TAQ reconstruction exactly.",
      "numerator": 10872,
      "denominator": 10917,
      "percent": 99.587799,
      "field": "high",
      "evidence": [
        "results.json#/daily/fields/high"
      ],
      "sources": [
        "S1",
        "S2",
        "S4",
        "S5",
        "S6"
      ],
      "limit": "Sample field concordance with a reconstruction; not archive-wide accuracy or exchange endorsement."
    },
    {
      "id": "D_LOW",
      "statement": "For the mapped 1 July 2026 sample, 10,874 of 10,917 comparable daily low values (99.6061%) matched the documented NYSE Daily TAQ reconstruction exactly.",
      "numerator": 10874,
      "denominator": 10917,
      "percent": 99.606119,
      "field": "low",
      "evidence": [
        "results.json#/daily/fields/low"
      ],
      "sources": [
        "S1",
        "S2",
        "S4",
        "S5",
        "S6"
      ],
      "limit": "Sample field concordance with a reconstruction; not archive-wide accuracy or exchange endorsement."
    },
    {
      "id": "D_CLOSE",
      "statement": "For the mapped 1 July 2026 sample, 10,908 of 10,917 comparable daily close values (99.9176%) matched the documented NYSE Daily TAQ reconstruction exactly.",
      "numerator": 10908,
      "denominator": 10917,
      "percent": 99.91756,
      "field": "close",
      "evidence": [
        "results.json#/daily/fields/close"
      ],
      "sources": [
        "S1",
        "S2",
        "S4",
        "S5",
        "S6"
      ],
      "limit": "Sample field concordance with a reconstruction; not archive-wide accuracy or exchange endorsement."
    },
    {
      "id": "M_HIGH",
      "statement": "On 1 July 2026, 7,395 of 7,410 matched regular-session minute high values (99.7976%) agreed exactly under the prespecified SIP-time reconstruction.",
      "numerator": 7395,
      "denominator": 7410,
      "percent": 99.797571,
      "evidence": [
        "results.json#/minute/sip/by_session/reg/fields/high"
      ],
      "sources": [
        "S1",
        "S5",
        "S6",
        "S7",
        "S8"
      ],
      "limit": "Prespecified purposive cohort; unmatched bars within the 19-file comparison scope are separately reported. Not an independently certified accuracy rate."
    },
    {
      "id": "M_LOW",
      "statement": "On 1 July 2026, 7,390 of 7,410 matched regular-session minute low values (99.7301%) agreed exactly under the prespecified SIP-time reconstruction.",
      "numerator": 7390,
      "denominator": 7410,
      "percent": 99.730094,
      "evidence": [
        "results.json#/minute/sip/by_session/reg/fields/low"
      ],
      "sources": [
        "S1",
        "S5",
        "S6",
        "S7",
        "S8"
      ],
      "limit": "Prespecified purposive cohort; unmatched bars within the 19-file comparison scope are separately reported. Not an independently certified accuracy rate."
    }
  ],
  "limitations": [
    "The reference and HDN upstream may share exchange/SIP inputs; agreement does not independently validate every upstream market event.",
    "A one-day NYSE trade file and a purposive minute cohort do not establish archive-wide accuracy. Repeated bars and fields are correlated observations, not independent samples.",
    "Prepared by HistoricalData.net, the supplier under evaluation. This is a self-assessment using third-party inputs, not an independent audit or NYSE/Cboe certification.",
    "The NYSE reference is consolidated transaction data. Our OHLC reconstruction is documented code, not an official NYSE aggregate or a uniquely correct market price.",
    "Minute OHLC depends on time bucketing, eligibility, late messages and special-condition handling. Disagreement is measured; its cause is not automatically attributed to HDN or the reference.",
    "Daily volume, trade counts, minute volume and the Cboe interval supplement remain diagnostic unless their aggregation definitions are fully aligned.",
    "Raw OHLC columns only. Adjusted prices, dividends, splits, VWAP, total-return calculations and other dates are not validated.",
    "Current file labels may differ from historical tickers. Only explicit published symbol history and same-day master mappings are used; unmatched or ambiguous identifiers are not guessed.",
    "Public-sample availability does not establish permission to redistribute raw data. This package contains code, hashes and aggregate comparison evidence only."
  ],
  "unsupported_claims": [
    "99.99% archive-wide accuracy",
    "NYSE or Cboe certification",
    "all reference differences are HDN errors",
    "a day with no matched bar has zero trading"
  ],
  "version": "1.0",
  "datePublished": "2026-10-22",
  "dateModified": "2026-10-22"
}