CAS provides a rich collection of mortgage-specific functions. These include functions to compute:
- Average Life
- Balance
- Convexity
- Duration
- Modififed Duration
- Present Value
- Price
- Yield
- CPR
- Payment
- Rate
- Term
Many of these functions are provided in two varieties, using scalar and vector solutions. For example, a yield can be computed given a price, a rate, a term, and a CPR, or it can be more generally computed given a price, a starting balance, and vector of cashflows (often produced by the cashflow function). In addition, there are functions to generate PSA and SDA curves, compute delinquency status from payment history strings, and validate payment history strings.