{
  "version": "2026-10-15-v2.1",
  "generated_at": "2026-10-15T08:11:27.738819+00:00",
  "as_of": "2026-10-14",
  "rule_sha256": "c62b3ec3359503cee9e2561a80f86354c5054b6d20134d56aef677417bb247db",
  "rules": {
    "version": "2026-10-15-v2.1",
    "status": "retrospective_walk_forward_candidate_not_live_track_record",
    "created_before_v2_results": true,
    "history_start": "2022-01-01",
    "comparison_start": "2025-09-23",
    "comparison_end": "2026-09-22",
    "data_end": "2026-10-14",
    "horizons": [
      5,
      10,
      20
    ],
    "features": [
      "return_2_vol",
      "return_5_vol",
      "return_20_vol",
      "return_60_vol",
      "efficiency_20",
      "volatility_20_60",
      "raw_cost_10_vol",
      "oi_change_20",
      "volume_5_20"
    ],
    "feature_notes": "Same HC contract within every lookback, historical signal-day OI selection, no spliced contract returns; I and J use a common delivery month. All features from closed daily bars. Fundamental histories lacking release vintages are excluded from fitted features and retained as a separate research layer.",
    "selection": {
      "min_days_to_delivery": 45,
      "min_hc_history_sessions": 61,
      "min_raw_history_sessions": 11,
      "volume_required": true
    },
    "model": {
      "type": "ridge_regression_per_horizon",
      "target": "same-contract next-open to Nth holding close change / (signal close * 20-day daily-return volatility * sqrt(N))",
      "target_clip": 4.0,
      "feature_z_clip": 4.0,
      "alpha": 100.0,
      "intercept_penalty": 10.0,
      "training_max_samples": 756,
      "training_min_samples": 252,
      "refit": "first eligible signal date of each calendar month, expanding then rolling training",
      "embargo_sessions": 1,
      "purge": "training exits must be at least two trading sessions before the prediction signal date; preprocessing fit on the same training rows only",
      "overlap_note": "Training labels overlap; the test primary sampling does not. Training row count is not an independent-sample count."
    },
    "decision": {
      "neutral_band_risk_units": 0.2,
      "cost_multiplier": 1.5,
      "rule": "direction only if absolute predicted change exceeds max(0.2 * horizon risk scale, 1.5 * estimated round-trip cost); otherwise neutral",
      "probability": "No win probability is inferred from the regression score."
    },
    "costs": {
      "slippage_per_side": 2.0,
      "fee_fraction_per_side": 0.0001,
      "stress_multiplier": 2.0
    },
    "execution": "Signal after daily close, next session open, same-contract Nth session close; every intermediate bar required. Flat OHLC entry bars are excluded as unverified execution; hypothetical fills do not guarantee tradability.",
    "evaluation": {
      "primary": "fixed non-overlap blocks anchored at comparison_start; neutral blocks retain their position",
      "offset_sensitivity": "all 0..N-1 block offsets reported without selecting the best; offsets are overlapping alternatives, not independent trials",
      "baselines": "V1 frozen original where available, always long, always short, HC ten-day momentum; same dates and same-contract prices for baseline comparison",
      "metrics": [
        "direction_accuracy",
        "coverage",
        "wilson95",
        "net_profit_per_ton",
        "daily_close_mark_to_market_drawdown",
        "profit_factor",
        "quarter_breakdown",
        "2x_cost_stress"
      ],
      "promotion_gate": "Each horizon separately: at least 20 primary directional trades, Wilson lower bound >50%, positive net PnL, 2x-cost net positive, beat 10-day momentum on identical trades in accuracy and net PnL, more than half eligible quarters profitable, median offset mean net positive and median offset advantage over momentum positive.",
      "post_comparison": "2026-09-23 onward shown separately; also retrospective, not a previously sealed holdout."
    },
    "tuning_policy": "Single prewritten specification; no searching thresholds or choosing a winner after the one-year results. Rejected candidates remain visible. More independent forward observations are required before production use."
  },
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  "limitations": [
    "所有结果均为本次回顾性研究，滚动训练不能消除研究设计时已知市场历史的影响。",
    "基本面首发时间与修订档案不完整，V2训练仅纳入可确定交易日的分合约行情；基本面保留在独立研究层。",
    "命中率区间是近似提示；重叠训练标签及不同抽样起点不能当作独立样本。",
    "回撤按每日收盘盯市，不含日内波动、保证金、资金利息和真实冲击成本。",
    "全年平仓价为新浪历史归档，未取得交易所结算价；盘后夜盘归属按源站交易日。"
  ]
}