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Technical Note - MSCI Prepayment Model Tuning Overlay - April 2014

This Technical Note introduces the MSCI Tuning Overlay, a new feature offered in RiskManager that allows users to select MSCI preset tuning parameters for the AD&Co Vectors Analytics prepayment model. This new MSCI feature affects the valuation of fixed-rate agency mortgage-backed securities, giving more weight to recent trends in historical prepayment speeds, and provides an additional view on MBS market conditions. The MSCI Tuning Overlay may be used in addition to AD&Co’s recommended tunings, and can be freely combined with user-defined AD&Co tunings.