 gbanyan
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d4f370bd5e
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Add Scripts 39b/c/d/e + 40b + 43: anchor-based FAR diagnostics
Spike checkpoint in response to codex rounds 28-30 review:
- 39b/c: signature-level dip test on Big-4 and non-Big-4 marginals
- 39d: dHash discrete-value robustness (raw vs jittered + histogram
valleys + firm residualization); confirms within-firm dHash dip
rejection is integer-mass-point artefact
- 39e: dHash firm-residualized + jittered 2x2 factorial decomposition;
confirms Big-4 pooled dh "multimodality" is composition + integer
artefact (centered + jittered p=0.35, 0/5 seeds reject)
- 40b: inter-CPA per-pair FAR sweep (cos + dh marginal + joint +
conditional); replicates v3 cos>0.95 FAR=0.0006 and provides
v4-new dh FAR curve
- 43: pool-normalized per-signature FAR (codex round-30 fix for
per-pair vs per-signature conflation); per-sig FAR for deployed
any-pair rule = 11.02%, per-firm structure shows Firm A 20% vs
B/C/D <1%
These scripts replace the distributional path (K=3 mixture / dip /
antimode) with anchor-based threshold derivation. Companion
artefacts in reports/v4_big4/{signature_level_diptest,
midsmall_signature_diptest, dhash_discrete_robustness,
inter_cpa_far_sweep, pool_normalized_far}/.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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2026-05-13 14:08:49 +08:00 |
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