You can add prepayment information for amortizing securities that are backed by loans and have a schedule of principal repayments and time series information, such as the following: ■ Certificates
- Certificates of amortizing revolving debt (CARDs), which are asset backed securities backed by credit card loans. These types of securities do not have a scheduled principal repayment on a specific timely basis. However, they have an effective maturity date that can change over time.
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- Certificates for automotive receivables (CARs), which are asset backed securities backed by car loans. The monthly prepayment is expressed as a percentage of the original collateral amount, known as the absolute prepayment speed (ABS).
For example, suppose you provide prepayment time series information with an effective date of 03/01/14 and a value of 04/01/14 and a lot is earned through 04/30/14. You can roll back a position's earnings to 03/01/14 and roll the earning's forward to 04/30/14. The system uses the values in place based on the specified effective date. When earnings are rolled back to 03/01/14 and replayed to 04/30/14, the system uses the time series information on 03/01/14, from 03/01/14 through 03/31/14, and then switches to the time series information on 04/01/14, from 04/01/14 through 04/30/14.