{
  "artifacts_reviewed": [
    "analysis JSON",
    "research_memo",
    "referenced figures (regression-quintiles.png, forecast-error.png, 2024-overperformers.png) not independently verifiable"
  ],
  "created_at": "2025-01-01T00:00:00Z",
  "decision": "block",
  "findings": [],
  "model": "ridge-regularized linear expected-touchdown model (per analysis JSON); research memo specifies OLS slope estimand with position fixed effects",
  "role": "statistician",
  "summary": "The evidence bundle does not support the article's central claims. The stated estimand is an OLS slope of next-season TD rate on current-season TD rate, but the analysis instead reports quintile means and forecast-error metrics for a ridge expected-TD model; no slope estimate, confidence interval, or test of H1 (0 < beta_1 < 1) is presented. The headline '8.9% MAE improvement' is not reproducible from the reported metrics: the expected-TD MAE (2.379) vs last-year-actual MAE (2.610) gives an 8.86% improvement, but the bootstrap 95% CI for the MAE delta [0.087, 0.378] is reported in TD units while the improvement is computed on a different scale, and the claimed probability 0.9994 that expected beats actual is inconsistent with a CI whose lower bound (0.087) is close to zero relative to its width. The walk-forward evaluation covers only 2018-2024 (950 predictions) while the descriptive quintile analysis spans 2014-2024 (551 pairs), so the headline improvement and the quintile 'regression to the mean' narrative come from different samples and neither is tied to the pre-registered estimand. The 'Most under' quintile shows next-season TDs (4.29) below expected TDs (5.62), which contradicts a pure regression-to-the-mean story and is not explained. Attrition/survivorship is acknowledged as a risk but no attrition table is included in the bundle, so the selection effect conditioning on >=40 targets cannot be assessed. The forecast-error chart is referenced but no per-season breakdown is provided to verify the rolling-origin lock. The article's claims are therefore unsupported by the presented evidence."
}