Model build model-2026-08-22 (PRISM-US-MH-0.7)
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v0.7: Market Sensitivity (beta) split from Residual Volatility. Beta significant in 83.7% of daily cross-sections; mean daily R² 0.159 → 0.178; overall bias 1.05 → 1.01. Evidence: docs/DECISIONS.md §12. See docs/METHODOLOGY.md. Not investment advice.