Questions tagged [vasicek]
The vasicek tag has no usage guidance.
55
questions
4
votes
1answer
155 views
Why isn't the Vasicek model arbitrage-free?
Could anyone explain why the Vasicek model isn't an arbitrage-free model?
Additionally, which interest rate model is arbitrage-free and why?
1
vote
0answers
44 views
Derive the discount bond prices of the Vasicek model by the PDE approach
The question is shown above.
Anyone can help me?
0
votes
1answer
58 views
If short rates $r(t)$ do not determine the bond prices $P(t, T)$, then what is the basis for short rate models?
The question title says it all: We know that in general, specifying the short rate $r(t)$ does not specify the bond prices $P(t, T)$. So how can a model for short rates—for example the Vasicek model—...
1
vote
1answer
50 views
Aggregation of $\rho$ and $p$ for a vasicek model
I'm currently facing the problem of how properly (analytically) adjust the parameters of an aggregated Vasicek (2002) loss distribution so that it has the same expected loss and 99% quantile as the ...
2
votes
0answers
33 views
State price deflator in the Vasicek model
I am trying to implement a simple bond pricing model using state price deflators in a Vasicek model. I am simulating paths of the processes
$$\mathrm{d}r^{P} =\kappa^{P}(\theta^P - r^P(t))\mathrm{d}t ...
1
vote
0answers
44 views
Can I use 1M Libor monthly data to estimate Vasicek parameters and use them to price quarterly swap
I am working on CVA algorithm. I am using vasicek model to evolve short rate. At hand, I am supposed to value a fixed to floating IRS quarterly paying.
Can I use 1M Libor as surrogate for short ...
4
votes
1answer
124 views
Bond-price dynamics in the Vasicek model
Hello I am studying about interest rate modeling
There is one good source about Vasicek (link: https://web.mst.edu/~bohner/fim-10/fim-chap4.pdf). However there is one equation that I try but unable ...
0
votes
0answers
87 views
cashflow for floorlet option on 1 month Libor under Vasicek
I have to figure out the cashflow for a floorlet option written on 1 month Libor under Vasicek model by considering yield curve power series expression and bond pricing equation:
Has anyone an idea ...
0
votes
1answer
88 views
Vasicek model and spot interest rate parametrised by reversion rate
By solving an SDE I want to derive the analytical results for mean and variance of the process of extended Vasicek model.
$$
dr(t) = \left(\eta - \gamma r(t) \right)dt + c dX(t)
$$
where $\gamma$ ...
2
votes
0answers
107 views
Term structure equation in the Vasicek model
Consider the SDE $$dr_t = (b-ar_t)dt +\sigma dW_t, \text{with } a; b > 0.$$ Let $$F(t; r) = E(\exp(-\int_{t}^{T}r_sds)| r_t = r).$$ (F can be interpreted as price of a zero coupon bond with ...
0
votes
0answers
73 views
Fitting to Market Data in Extended Vasicek / Hull White
I need your help for my task.
I need to calibrate to the market data for Hull White model for Zero Coupon Bond Price. I refer to John Hull and Alan White paper. I want to ask you a few questions and ...
0
votes
1answer
79 views
Vasicek and Extended Vasicek Model
I want to ask about basic reasoning in Vasicek and Extended Vasicek model.
Why $P(T,T) = 1$ for non arbitrage model? Can we place $P(T,T) = 10$ or other numbers? Is it correlated with The Law of ...
1
vote
0answers
103 views
Need to solve the stochastic differential equation of Vasicek Model
How to solve the stochastic differential equation of the Vasicek model for the analysis of credit risk? I search in the article "The Distribution of loan portfolio value" (Vasicek) but he doesn't ...
1
vote
1answer
39 views
Finding B(t) in the Vasicek model relating to the bond equation, more specifcally from the initial condition
In the Vasicek model for derving bond prices, we have the ODE $$\frac{dB}{dt}=\gamma B-1$$ which gives rise to the general solution $$B(t)=C_1 e^{\gamma t}+C_2$$My problem is that we have the "initial"...
3
votes
1answer
139 views
Vasicek model: joint simulation with discount factor
In Vasicek model, we have the following relation to get Discount factors given the value of short rate:
$$P(t\,,T)={{e}^{A(t,T)\,-\,B(t,T){{r}_{t}}\,}}$$
So, Discount factors are known as soon as we ...
1
vote
1answer
121 views
Derive a mathematical equation for Eurodollar future rate
If we suppose that r(t) follows a Vasicek model, which is:
$$dr(t) = (\mu - \kappa r(t))dt + \sqrt\sigma dW(t)$$
How to derive an expression for Eurodollar future rate?
2
votes
1answer
210 views
Differential of integrating factor $d(e^{at}r_t)$ in Vasicek model
I am attempting to solve the Vasicek model SDE (using Wikipedia parametrisation):
$$
dr_t = a(b-r_t)dt + \sigma dW_t
$$
Every solution is proceeding to multiply both sides of the equation by the ...
1
vote
0answers
117 views
basic difference between interest rate models
I am reading up on interest rate models, but currently confused about difference in the two types of models:
no arb models like ho-lee, vasicek etc.
others like nelson siegel, pca models etc.
While ...
1
vote
1answer
282 views
Vasicek short rate: Risk-neutral measure into real-world measure
I consider the Vasicek model under the risk-neutral measure $\mathbb{Q}$:
$$ dr_t=\kappa(\theta−r_t) dt+\sigma dW^{\mathbb{Q}}_t.$$
I have already determined $$\mathbb{E}^{\mathbb{Q}}\left[e^{−\int\...
1
vote
1answer
156 views
Two papers - two different solutions of the Ornstein-Uhlenbeck process
Bernal 2016 says that the solution of
$$ dr_{t}=\lambda*(\mu-r_{t})*dt+\sigma dW_{t} \qquad (eq.1) $$
equals
$$ r_{t}=r_0*exp(-\lambda t)+\mu(1-exp(-\lambda t))+\sigma \int_{0}^{t} exp(-\lambda t)...
2
votes
0answers
64 views
Bond prices at future times under Vasick one-factor model
In Vasicek one-factor model (and in other affine models), the price of a zero-coupon bond at time $t$ conditional on the information at this time is
$$P(t,T) = E[e^{-\int^T_tr(u)du}|F_t] = A(t,T)e^{-...
3
votes
0answers
138 views
What is the purpose of short rate models?
Just venturing into quantitative finance and studying short rate models (Vasicek, CIR, Hull-White etc.). Wanted to ask a very simple intuitive question. How would a practitioner use these models? I ...
1
vote
1answer
668 views
Hull-White Extension of Vasicek Model
I am reading the book Interest Rate Models by Brigo and Mercurio and try to understand the Hull White Model Extended Vasicek Model. They start off by defining the instantaneous short-rate process ...
1
vote
1answer
154 views
Term structure used in Geometric Brownian Motions under Risk Neutral Measure?
When using a GBM under a risk-neutral measure to simulate stock prices, we have to use the risk-free interest rate, but how exactly do you determine what interest rate to use?
I have used the Vasicek ...
0
votes
1answer
43 views
compute r(t) in Vasiceck model, what is $e^{at}r$
I know how to solve the exercise using the hint. But I do not understand where the hint is coming from. Is it just continous compounding?
Can anybody explain $f(t,r) = e^{at}r$?
What does it stand ...
0
votes
1answer
101 views
time step choice impact in Vasicek model simulations
I am trying to make some computations using Vasicek short rate model. Especially I a trying to compare exact expectation(obtained with the formula) and the expectation from Monte Carlo simulation.
...
5
votes
1answer
2k views
Vasicek model calibration
I am trying to calibrate Vasicek model, i.e. to determine the parameters $\kappa, \mu, \bar{\mu}$ and $\sigma$ where the process dynamics are given through
$$ dr_t=\kappa\left( \mu - r_t\right) dt+\...
0
votes
0answers
336 views
Vasicek Model - Should I simulate short-rate under the real-world or risk-neutral measure if I am interested in simulating future bond prices
In the classic Vasicek model, the market's short rate process $(r_t)_{t \geq 0 }$ is given through the SDEs:
$$ dr_t=\alpha \left( \bar{\mu} - r_t\right) dt+\sigma d W^{\mathbb{P}}(t), $$
$$ dr_t=\...
0
votes
1answer
171 views
Help evaluating covariance integral when deriving vasiceks model
Im working through a solution to evaluating pricing for Vasiceks model
However i dont understand the u∧t terms and how that behaves under the integrals...any help??
Cheers
1
vote
1answer
350 views
Difference between the Basel IRB and the Vasicek formula
The well known Basel IRB formula is as follows:
$${\displaystyle K=LGD*\left[N\left({\sqrt {\frac {1}{1-R}}}*G(PD)+{\sqrt {\frac {R}{1-R}}}*G(0.999)\right)-PD\right]}$$
where the term below is the ...
2
votes
0answers
122 views
Basic Interest Rate Modelling Ques
I have got a question regarding the Vasicek Model and the corresponding Bond Pricing Equation (BPE).
Starting with a short-rate process (under measure $P$ or real world drift $u(r,t)$) of the form:
$...
2
votes
0answers
154 views
Price of a Bond-Call option in the defaultable framework
I would like to compute the price for a Call option written on a defaultable bond as underlying.
Suppose you have the following dynamic under the risk free measure $\mathcal{Q}$ for the interest rate:
...
1
vote
1answer
72 views
How to find the transition distribution functions of these two processes?
This question was asked by another user, but was deleted. As it may be useful for others, I re-post it here.
What are the transition distribution (or density) functions of two processes defined by
\...
2
votes
1answer
125 views
How to find the transition distribution functions of these two processes?
What are the transition distribution (or density) functions of processes defined by
$dX_t=\mu dt +\sigma dW_t$
and
$dX_t= \theta(\mu-X_t) dt +\sigma dW_t,$
where $\theta>0$, $\mu$ is a real ...
2
votes
0answers
628 views
Complete Algorithm of Calibration with Vasicek Model using Term-Structure Dynamics over Time
As there are so many different sccenarios about Vaicek Calibration but there has not been a clear example with data shown, I am totally Confused about how should I do it. so I am bringing the question ...
1
vote
0answers
165 views
Pricing with Vasicek model on basket of credit spreads
I would appreciate help with a valuation of a fixed income derivative, with an embedded exit option.
Summary:
Goal is to provide valuation of a fixed schedule of quarterly cash flows with an option ...
1
vote
1answer
48 views
How to understand the following limits when kapa limits to Zero
The equation is quite simple, however it is not very obvious to me to have the following relationship:
$$\begin{equation}
\frac{1-exp(-\kappa(T-t))}{\kappa}\rightarrow(T-t) \quad \rm{when\space} \...
7
votes
1answer
596 views
How to show that this process is “normally distributed”?
Say we have following SDE (Vasicek):
$$dr(t) =(b-ar_t) dt + \sigma dW_t$$
I am able to reach an integral form of this SDE :
$$r(t) = r(0) e^{-at} + \frac{b}{a}[1 - e^{-at}] + \sigma e^{-at}\int_0^t e^...
1
vote
1answer
70 views
Why does the correlation between r and V in Longstaff and Schwartz 1992 model is positive?
I am reading the Longstaff and Schwartz's 1992 and 1993.
From $r = \alpha x + \beta y$ and $V = \alpha^2 x + \beta^2 y$. It was mentioned in the paper that the $r$ is positive correlated with $V$.
...
2
votes
1answer
149 views
What is the limiting distribution of loss portfolio?
I am working through this paper on Vasicek's portfolio loss distribution.
On page 3 he mentions that by the law of large numbers,
$$\lim_{n\to\infty}\sum_{k=0}^{\lfloor nx \rfloor} \binom{n}{k}s^k(1-...
1
vote
1answer
831 views
LIBOR rates from Vasicek/Hull-White model?
I am somehow puzzled by the following problem:
LIBOR rates are forward rates for an interbank loan for 1M or 3M (let's limit the range of possibilities to these two cases). Assuming that I have ...
1
vote
1answer
461 views
LIBOR 3M and 1M from Vasicek model
I would like to discuss my approach toward modelling of interest rates with respect to its downsides and advantages.
My problem is to forecast daily LIBOR 3M and LIBOR 1M over a particular time ...
3
votes
2answers
867 views
How to show that the exponential Vasicek model is not an affine term-structure model?
From the pricing formula, we know that the value at time $t\in [0,T]$ of a zero coupon bond maturing at time $T$ is
$$
B(t,T)=E\left(\exp{\left(-\int_{t}^{T}r_sds\right)}\bigg|\mathcal{F}_t\right).
$$...
1
vote
1answer
511 views
Vasicek model problem
I am analyzing a problem where the below is given
Vasicek model with risk-neutral dynamics
$$dr_t = \kappa (\theta - r_t)dt + \sqrt{r_t} dW_t \quad \quad (1) $$
bond prices $$P(t,T)=e^{A(t,T)-B(t,T)...
1
vote
0answers
92 views
On the construction of a Brownian motion from a Gaussian process
Let $X$ a Gaussian process defined by
$$
X_t=\int_{0}^{t}\left(\frac{1}{\sigma}\left(r_s-\frac{\sigma^2}{2}\right)-\rho\sigma_P(s,T)\right)\mathrm{d}s+\sqrt{1-\rho^2}Z_2(t)+\rho Z_1(t);\;\;t\in[0,T]
$...
4
votes
2answers
732 views
How to price a stock under Q and stochastic interest rates?
I am interested in pricing a stock under $\mathbb{Q}$ when I assume that
$$dS(t) = \mu(S(t))dt + \sigma(S(t))dW(t)$$
where $W(t)$ is a Wiener process under $\mathbb{P}$ and
$$dr(t) = a(b-r(t))dt +...
1
vote
1answer
433 views
Timesteps in Vasicek model
When simulating stocks one can easily use GBM with only one random variable per simulation to create a new stock price in say 5 years, you don't need to create the whole asset paths if you don't need ...
2
votes
1answer
111 views
simulation and timestep
Suppose I have a stochastic process i.e. a Vasicek process with parameteres estimated with monthly (RW measure) data and want simulate the process using a daily timestep. Is this a good practice?
2
votes
0answers
55 views
MLE for two independent factor CIR
Following the maximun likelihood estimation as done in Klavidko I would like to generalize this to more independent factors . In first istance I would use the transition function at time t as a sum ...
2
votes
1answer
2k views
Pricing a zero with Vasicek model
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}...
