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feat: Lifetime PD (50yr) - Belkin & Suchower + Vasicek model

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- Belkin & Suchower (1998) credit cycle index (Zt) estimation via WLS
- Vasicek single-factor conditional PD/TM model
- Macro-Zt OLS regression with stepwise variable selection
- 3-scenario (boom/neutral/recession) 50yr PD projection
- Statistical validation suite (ADF, Ljung-Box, R2, ARCH)
- BOK ECOS API integration with fallback data
- Visualization module (7 chart types)
- Detailed theoretical methodology docs/methodology.md
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Variet Agent
2026-03-10 21:57:34 +09:00
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# Validation: 통계적 유의성 검증