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Week 7.10: Ornstein-Uhlenbeck process. I'm trying to understand bond pricing with the Vasicek interest rate model. I'm using McDonald's book for this purpose (not homework). Recall that Vasicek dynamics are \begin{equation*} \mathrm{d}r_t = a(b - r_t) \mathrm{d}t + \sigma \mathrm{d}Z_t. \end{equation*} Now, Macdonald introduces the exponential affine formulas to price a unit zero: Like the Cox-Ingersoll-Ross model, the Vasicek model is also a one-factor modeling method. However, the Vasicek model allows for negative interest rates as it does not include a square root The model One-factor model.

It is a type of "one factor model" (short-rate model) as it 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 Value. rvasicek returns a (n, m+1) matrix of n path of the Vasicek process.dvasicek returns a vector of size length(x)-1.Note that the first value has no density. lvasicek returns the log-liklihood associated to dvasicek and evasicek returns the Maximum Likelihood Estimator of the parameters (mu, a, sd).

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Keywords: Bond pricing, Vasicek model, Martingales, HJM methodology, Forward measure. 1.

### bengtzzon: januari 2014

The Vasicek Interest Rate Model is a mathematical model that tracks and models the evolution of interest rates.

This work corrects errors in the original paper by Mallier and Deakin [ 1 ] on the Green's function for the Vasicek convertible bond equation. 4.1. Vasicek Model Definition 4.1 (Short-rate dynamics in the Vasicek model). In the Vasicek model, the short rate is assumed to satisfy the stochastic diﬀerential equation dr(t)=k(θ −r(t))dt+σdW(t), where k,θ,σ >0andW is a Brownian motion under the risk-neutral measure. Theorem 4.2 (Short rate in the Vasicek model). Let 0 ≤ s ≤ t
stochastic calculus - Exact solution stock price with Vasicek interest rate model - Quantitative Finance Stack Exchange Define two correlated stock price- and interest rate (Vasicek) processes, governed by the Wiener processes $W^{S}(t)$ and $W^{r}(t)$
The Vasicek model exhibits a mean-reversion, which helps predict future interest rate movements. As shown in the table below, when market shocks cause the interest rate (or “short rate”) to be higher than the long term mean, the drift factor (dr t = a(b-r t )) is lower than 0 – indicating that the interest rate is likely to decrease.

Teoretisk bakgrund labbrapport

Vasicek models the short rate as a Ornstein-Uhlenbeck process. The short rate is the annualized interest rate at which an entity can borrow Consider the Vasicek model where the current short-term rate is 2%, the long-run mean is 6%, the instantaneous standard deviation is 10%, and the rate of adjustment is 0.4.

For the model (19.1,19.2), there is a closed form solution for plain vanilla calls and puts. For a constant (time independent) stock volatility σS,t = σS, a derivation
require the solution of a system of linear equations as well as some boundary information at r- and r,. In the Vasicek (1977) model, if r is low enough,. Dec 15, 2018 the solution to the bond-pricing equation can be expressed.

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### Evaluating SEB Investment Strategy`s - DiVA portal

The CIR model specifies that the instantaneous interest rate follows the stochastic differential equation, also named the CIR Process: = (−) + where is a Wiener process (modelling the random market risk factor) and , , and are the parameters.The parameter corresponds to the speed of adjustment to the mean , and to volatility. The drift factor, (−), is exactly the same as in the Vasicek model. Solving the Vasicek model for reversion to the mean of interest rates. Reminder: Ito Lemma: If dX = a(X,t)dt+b(X,t)dW Then dg(X,t) = agx + 1 2 b2g xx +gt dt+bgxdW . The Vasicek model is dX = α(r −X)dt+sdW Look at g(X,t) = eαt(X − r). From Ito: dg = (α(r −X)eαt +αeαt(X − r))dt+seαtdW = seαtdW .