CFAI EOC Rdg58 ABS #15: CPR calc inconsistency
I am confused with CPR calc. Please help!
Looks like a custom HELOC ramp:
“The model used with respect to the loans (the “prepayment ramp”) assumes that the home equity loans prepay at the rate of 5% in the first month after origination, and an additional 1.8% each month thereafter until the 12th month. Beginning in the 12th month and each month thereafter, the prepayment ramp assumes a prepayment rate of 24.8% CPR”
Calc the CPR assuming 200% PPC (same as PSA for HELOC). I find inconsistency in how the book calcs the CPR. Is it how it works or is it time for me to get some rest right now?
Month 2: (5+1.8)*2 = 13.6
Month 11: [5+(1.8*11)]*2 = 49.6% |
发表于 2013-4-3 03:06
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