Cox-Ingersoll-Ross model

The Cox-Ingersoll-Ross model in finance is a mathematical model describing the evolution of interest rates. It is a type of "one factor model" (Short rate model) as describes interest rate movements as driven by only one source of market risk. The model can be used in the valuation of interest rate derivatives. It was introduced in 1985 by John C. Cox, Jonathan E. Ingersoll and Stephen A. Ross as an extension of the Vasicek model.
See more at Wikipedia.org...