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SMM stands for single-month mortality and CPR stands for constant (or conditional) prepayment rate. They're both units of voluntary prepayment rates ($CPR = 1-(1-SMM)^{12}$). They could be based on either estimated or actual prepayments.
Where to get actual MBS prepayment data will depend on what type(s) of MBS pools you're modeling (e.g. agency, ...
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