COX-INGERSOLL-ROSS MODEL - CIR

Mathematical formula used to peg interest rate movements driven by the only source of market risk. The model stipulates short-term interest rates can be described through square root diffusion model with a mean reversion. It is frequently used in valuing interest rate derivatives. The CIR was developed by John C. Cox, Jonathan E. Ingersoll, and Stephen A. Ross in 1985.