{
  "id": 1971224,
  "title": "Point-in-Time Fundamentals for Numerai Signals: Killing Lookahead in Your Feature Join",
  "url": "https://urgent.news/2026/08/19/point-in-time-fundamentals-for-numerai-signals-killing-lookahead-in",
  "topic": "world",
  "section": "World",
  "published": "2026-08-19T16:00:35.000Z",
  "source": {
    "name": "Dev.to",
    "slug": "dev-to",
    "url": "https://dev.to/tradevodata/point-in-time-fundamentals-for-numerai-signals-killing-lookahead-in-your-feature-join-1h54"
  },
  "original_language": "en",
  "account": "Numerai's Signals can be biased by fundamentals data if constructed improperly. Joining on the wrong date leads to lookahead leakage. Fundamentals vendors provide data keyed by fiscal period end or generic report dates that don't indicate when the information was knowable. This can cause overinflated validation metrics in live performance. The fix is to use the \"first_filed\" timestamp from each fundamentals row, which indicates when the data became public on SEC EDGAR. This timestamp should be used to join with the Numerai submission date. The dataset should include original values (safe for backtests) and latest values (useful for restatement effects). This US annual-only dataset from Tradevo Data contains 5,193 US companies and 313,001 point-in-time rows. It covers 7 core concepts and up to 12 fiscal years of history, but does not include quarterly data or non-US tickers.",
  "summary": "If you build features for Numerai Signals from fundamentals, the single most common way to silently overstate your live performance is joining on the wrong date. Most fundamentals vendors ship data keyed by fiscal period end or a generic \"report date\" that gets overwritten on every revision. Neither tells you when the number was actually knowable. Numerai's tournament resolves against real future…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}