quantmodel — Hone optimum3: PDBC rank-7 near-miss expand (t175)

Objective

Hone optimum3: PDBC rank-7 near-miss expand (t175).

Notes: Shipped pdbc_expand_lo/hi=[0.80,0.90]. Official verify ITD monthly_corr=0.897 (was ~0.887), CAGRΔ=-0.63%, hist-alloc 12/12. Residual: 2017 SCZ sleeve (~0.60 yearly corr).

Approach

Reuses existing report research/findings/optimum3-corr-t175.md — tables/metrics preserved verbatim via source_report pointer. Body below summarizes grounded evidence from that report and adjacent artifacts.

Files / code / data changed

Associated commits (inferred from log grep t175):

b8f42bc9 research: optimum3 PDBC rank-7 near-miss expand (t175) (#169)
b8f42bc9 research: optimum3 PDBC rank-7 near-miss expand (t175) (#169)
Source report: research/findings/optimum3-corr-t175.md
Task-history entry: research/findings/task-history.json#t175

Results

Key table from source report (preserved):

variant	ITD corr	2015+ corr	CAGRΔ	recent hist-alloc
t128 baseline	0.887	0.916	−1.11%	11/12 (miss Jun-2026)
PDBC expand band [0.80, 0.90]	0.897	0.929	−0.63%	12/12

Conclusions and metrics are in research/findings/optimum3-corr-t175.md; see detail page for preserved tables/metrics.

Conclusions

Shipped pdbc_expand_lo/hi=[0.80,0.90]. Official verify ITD monthly_corr=0.897 (was ~0.887), CAGRΔ=-0.63%, hist-alloc 12/12. Residual: 2017 SCZ sleeve (~0.60 yearly corr).

Problems / follow-ups

See source report or PR discussion for follow-ups. No unsupported follow-ups fabricated.