Black-Karasinski Model

Formula

The Black-Karasinski model represents a one-factor short rate framework where the logarithm of the interest rate follows a mean-reverting process. By incorporating a stochastic component and time-dependent parameters, this approach ensures that interest rates remain strictly positive throughout the projection period. Quantitative analysts deploy this structure primarily to capture the volatility dynamics inherent in term structures that conventional Gaussian models fail to replicate accurately.