# Broad-universe fip_id IC research (Phase B)

Generated: 2026-07-18T19:48:28.127710

## Scope

- **Research only** — production universe, gate, scanner, schedule unchanged.
- Price-only signal harness; no sentiment/fundamentals on the broad tier.
- Point-in-time liquidity mask: top **1500** by 63d median $vol, price ≥ **$5.0** at as-of.

## Caveats

- **Survivorship bias**: today's constituents backfilled historically (worse in small caps).
- **IEX volume undercount**: relative $vol rank only, not absolute floors.
- **Pool skew**: nasdaq_all ∪ sp500 tilts tech/biotech; missing pure NYSE mid-caps.

## Fingerprint (505-name prod snapshot)

- Expected: IC ≈ -0.045, t ≈ -2.9
- Observed: IC = -0.045, t = -2.91, weeks = 35, reliable = True
- Pass: **True**

## Liquid-breadth signal_eval (fip_id)

**Not run yet in this environment** (no Alpaca credentials to build
`backtest_snapshots/research.sqlite`). Local machine with keys:

```bash
python scripts/extend_snapshot_universe.py --force-copy
python scripts/run_fip_breadth_research.py --skip-fingerprint --allow-spawn --workers 6
```

(`--skip-fingerprint` only after a green fingerprint on this machine.)

| metric | value |
|---|---|
| mean_ic | _pending_ |
| ic_t_stat | _pending_ |
| weeks | _pending_ |
| avg_cross_section | _pending_ |
| reliable | _pending_ |

## Verdict (iron rule)

- **Fingerprint:** green (IC −0.045 / t −2.91 / reliable / 35 weeks).  
- **Breadth iron rule:** **pending** until research.sqlite run completes.  
- Green breadth would authorize a **follow-up proposal** only (two-tier universe /
  gate revalidation) — **not** production wire-in.

## Artifacts

- Fingerprint report: `reports/fip-breadth-20260718-194828-fingerprint.json`
  (and summary `reports/fip-breadth-20260718-194828.json`)
- Breadth report: _pending_