quantmodel — Port + verify Growth-Trend Timing

Objective

Port + verify Growth-Trend Timing - Original vs AS metrics.

Notes: GTT Original replicated 2015+: corr 0.918 CAGRΔ -0.49%. Both-YoY INDPRO+RRSFS (AS prose says either). Spec/backtest/gtt.py + runner. Findings: gtt-original-scale-batch.md.

Approach

Reuses existing report research/findings/gtt-original-scale-batch.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 t33):

7be8be85 research: t33 Growth-Trend Timing Original replicated vs AS (#31)
7be8be85 research: t33 Growth-Trend Timing Original replicated vs AS (#31)
Source report: research/findings/gtt-original-scale-batch.md
Task-history entry: research/findings/task-history.json#t33

Results

Key table from source report (preserved):

id	status	monthly corr	overlap CAGRΔ	notes
gtt-original	replicated	0.918	−0.49%	t33: revised both-YoY + SMA (superseded by t68 → corr 0.9999)

Conclusions and metrics are in research/findings/gtt-original-scale-batch.md; see detail page for preserved tables/metrics.

Conclusions

GTT Original replicated 2015+: corr 0.918 CAGRΔ -0.49%. Both-YoY INDPRO+RRSFS (AS prose says either). Spec/backtest/gtt.py + runner. Findings: gtt-original-scale-batch.md.

Problems / follow-ups

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