{
 "config": {
  "selection_date": "2017-12-29",
  "adv_window_start": "2017-12-01",
  "sample_start": "2018-01-02",
  "sample_end": "2025-12-31",
  "min_history_months": 6,
  "min_months_in_sample": 6,
  "min_adv_usd": 5000000.0,
  "n_target": 300,
  "etf_share": 0.25,
  "holdout_share": 0.2,
  "seed": 41,
  "min_coverage": 0.8,
  "coverage_file": "results/metrics/coverage_audit_candidates.csv"
 },
 "created_at": "2026-11-02T22:57:34.569355+00:00",
 "n_candidates": 1152,
 "n_selected": 300,
 "n_heldout": 60,
 "n_delisted": 1,
 "instrument_master_version": null,
 "selection_rules": [
  "first_date <= 2017-12-29 - 6 months",
  "last_date >= 2018-01-02 + 6 months (documented survival requirement)",
  "average daily dollar volume over [2017-12-01, 2017-12-29] >= 5,000,000 USD",
  "proportional allocation over asset class x ADV tercile x volatility tercile; round-robin over SIC division / ETF category inside strata",
  "20% of selected instruments held out entirely (zero-shot), seed 41",
  "regular-hours 1-minute coverage over the sample window >= 80% (coverage audit, availability filter)"
 ],
 "instruments": [
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   "symbol": "ABT",
   "name": "Abbott Laboratories",
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   "first_date": "2000-01-04",
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   "n_days": 20,
   "last_close": 57.07,
   "coverage": 0.9976410393976749,
   "sessions_present": 2011.0,
   "base_symbol": "ABT",
   "delisted": false,
   "group": "manufacturing",
   "adv_tercile": "high",
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   "stratum": "stock|high|low",
   "role": "pooled"
  },
  {
   "instrument_id": "firstrate:stock:ACAD",
   "symbol": "ACAD",
   "name": "Acadia Pharmaceuticals",
   "asset_class": "stock",
   "status": "active",
   "first_date": "2004-05-28",
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   "last_close": 30.11,
   "coverage": 0.9432770855433357,
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  },
  {
   "instrument_id": "firstrate:stock:ACH",
   "symbol": "ACH",
   "name": "Accendra Health Inc",
   "asset_class": "stock",
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  },
  {
   "instrument_id": "firstrate:stock:ACM",
   "symbol": "ACM",
   "name": "Aecom",
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  },
  {
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   "symbol": "ADP",
   "name": "Automatic Data Processing",
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  },
  {
   "instrument_id": "firstrate:stock:AEE",
   "symbol": "AEE",
   "name": "Ameren Corp",
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   "instrument_id": "firstrate:stock:AEP",
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   "name": "American Electric Power",
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  },
  {
   "instrument_id": "firstrate:stock:AG",
   "symbol": "AG",
   "name": "First Majestic Silver",
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  },
  {
   "instrument_id": "firstrate:etf:AGG",
   "symbol": "AGG",
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  },
  {
   "instrument_id": "firstrate:stock:ALB",
   "symbol": "ALB",
   "name": "Albemarle Corp",
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   "first_date": "2000-01-04",
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  {
   "instrument_id": "firstrate:stock:ALK",
   "symbol": "ALK",
   "name": "Alaska Air Inc",
   "asset_class": "stock",
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   "last_date": "2026-10-30",
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  },
  {
   "instrument_id": "firstrate:stock:AM",
   "symbol": "AM",
   "name": "Antero Midstream Corporation",
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   "status": "active",
   "first_date": "2017-05-04",
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  {
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   "symbol": "AMLP",
   "name": "Alerian Mlp ETF",
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  },
  {
   "instrument_id": "firstrate:stock:APA",
   "symbol": "APA",
   "name": "Apache Corporation",
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  },
  {
   "instrument_id": "firstrate:stock:ARCC",
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  },
  {
   "instrument_id": "firstrate:etf:ARKK",
   "symbol": "ARKK",
   "name": "ARKInnovation ETF",
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  },
  {
   "instrument_id": "firstrate:stock:AU",
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  {
   "instrument_id": "firstrate:stock:AUPH",
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  },
  {
   "instrument_id": "firstrate:stock:AVT",
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  },
  {
   "instrument_id": "firstrate:stock:BCE",
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  },
  {
   "instrument_id": "firstrate:stock:BDN",
   "symbol": "BDN",
   "name": "Brandywine Realty Trust",
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   "instrument_id": "firstrate:stock:BDX",
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   "name": "Becton Dickinson",
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  {
   "instrument_id": "firstrate:stock:BHC",
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   "instrument_id": "firstrate:stock:BHP",
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   "name": "Bhp American Depositary Shares",
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