{
  "recent_months": 6,
  "methodology": "Leakage-safe model-drift monitor (display-only). Population Stability Index (PSI) compares the recent realized score distribution to the historical one; rolling cross-sectional rank-IC (recent mean vs full mean) is reported for context. All metrics use only realized (score, forward_return) pairs strictly before the latest unread month. PSI<0.1 stable / 0.1\u20130.25 moderate / \u22650.25 significant. NOT a research claim and NOT a retrain trigger (rerun-to-significance is forbidden).",
  "regions": {
    "us": {
      "region": "us",
      "n_history": 28134,
      "n_recent": 2934,
      "recent_months": 6,
      "psi": 0.2261,
      "ic_full": 0.0038,
      "ic_recent": -0.0023,
      "base_rate_full": 0.5369,
      "base_rate_recent": 0.5157,
      "regime": "moderate"
    },
    "cn": {
      "region": "cn",
      "n_history": 17960,
      "n_recent": 1795,
      "recent_months": 6,
      "psi": 0.5423,
      "ic_full": -0.0463,
      "ic_recent": 0.0808,
      "base_rate_full": 0.4517,
      "base_rate_recent": 0.4022,
      "regime": "significant"
    }
  },
  "status": "ok"
}