DEFINITION of 'CoxIngersollRoss Model  CIR '
A mathematical formula used to model interest rate movements driven by a sole source of market risk. The CoxIngersollRoss model (CIR model) believes that shortterm interest rates can be represented via a square root diffusion model with a mean reversion. The CIR model is often used in the valuation of interest rate derivatives.
INVESTOPEDIA EXPLAINS 'CoxIngersollRoss Model  CIR '
The CIR model was developed in 1985 by John C. Cox, Jonathan E. Ingersoll and Stephen A. Ross as an offshoot of the Vasicek Interest Rate model. Like the CIR model, the Vasicek model is also a onefactor modeling method. However, the Vasicek model allows for negative interest rates. This is the biggest advantage of the CIR model.
RELATED TERMS

Vasicek Interest Rate Model
A method of modeling interest rate movement that describes the ... 
Federal Open Market Committee  ...
The branch of the Federal Reserve Board that determines the direction ... 
Interest Rate Ceiling
The maximum interest rate that a financial institution can charge ... 
Interest Rate Options
An investment tool whose payoff depends on the future level of ... 
Interest Rate
The amount charged, expressed as a percentage of principal, by ... 
Fixed Interest Rate
An interest rate on a liability, such as a loan or mortgage, ...
RELATED FAQS

What is the difference between consumer surplus and economic surplus?
The consumer surplus is the difference between the highest price a consumer is willing to pay and the actual market price ... Read Full Answer >> 
What is the variance/covariance matrix or parametric method in Value at Risk (VaR)?
The parametric method, also known as the variancecovariance method, is a risk management technique for calculating the value ... Read Full Answer >> 
What does it signify about a given product if the consumer surplus figure for that ...
High consumer surplus for a particular product signifies a high level of utility for consumers and may carry some implications ... Read Full Answer >> 
What is backtesting in Value at Risk (VaR)?
The value at risk is a statistical risk management technique that monitors and quantifies the risk level associated with ... Read Full Answer >> 
How much variance should an investor have in an indexed fund?
An investor should have as much variance in an indexed fund as he is comfortable with. Variance is the measure of the spread ... Read Full Answer >> 
How is the riskfree rate of interest used to calculate other types of interest rates ...
The riskfree rate for bonds is used for pricing the yield spread as the difference between the interest rate on a bond and ... Read Full Answer >>
Related Articles

Economics
What is a Capital Account?
Capital account is an economic term that refers to the net change in investment and asset ownership for a nation. 
Fundamental Analysis
Explaining Expected Return
The expected return is a tool used to determine whether or not an investment has a positive or negative average net outcome. 
Economics
Understanding the Fisher Effect
The Fisher effect states that the real interest rate equals the nominal interest rate minus the expected inflation rate. 
Fundamental Analysis
Explaining the Geometric Mean
The average of a set of products, the calculation of which is commonly used to determine the performance results of an investment or portfolio. 
Investing
Three Portfolio Moves To Consider Now
What portfolio moves should you consider making as the 2nd quarter kicks off? Before we focus on the future, let’s first reflect on the 1st Q surprises. 
Investing
The Labor Market Recovery’s Missing Ingredient
Job creation is running at the fastest pace since the 90s, and there is some evidence that wage growth is finally starting to accelerate, albeit modestly. 
Economics
Gambling on Macau: Too Risky?
Macau was once heralded as the new Las Vegas for casino investors. Is it too late? 
Investing
Pockets Of Value In The Stock Market
U.S. stocks benefited from signs the Fed’s path toward higher interest rates, as well as from continued mergerandacquisition activity on of low rates. 
Economics
When To Expect Fed Liftoff Now
“When will the Fed raise interest rates?” That has been the question of many investors since the Fed indicated it was prepared to end its zero rate policy. 
Economics
Why Is The Federal Reserve Independent?
An overview of the independent status of the Federal Reserve and arguments for and against it.