Efficient and Stable Exponential Runge-Kutta Methods for Parabolic Equations

In this paper we develop explicit fast exponential Runge-Kutta methods for the numerical solutions of a class of parabolic equations.By incorporating the linear splitting technique into the explicit exponential Runge-Kutta schemes,we are able to greatly improve the numerical stability.The proposed numerical methods could be fast implemented through use of decompositions of compact spatial difference operators on a regular mesh together with discrete fast Fourier transform techniques.The exponential Runge-Kutta schemes are easy to be adopted in adaptive temporal approximations with variable time step sizes,as well as applied to stiff nonlinearity and boundary conditions of different types.Linear stabilities of the proposed schemes and their comparison with other schemes are presented.We also numerically demonstrate accuracy,stability and robustness of the proposed method through some typical model problems.

A novel stochastic modeling framework for coal production and logistics through options pricing analysis

We propose a novel stochastic modeling framework for coal production and logistics using option pricing theory.The problem of valuing the inherent real optionality a coal producer has when mining and processing thermal coal is modelled as pricing spread options of three assets under the stochastic volatility model.We derive a three-dimensional Fast Fourier Transform(“FFT”)lower bound approximation to value the inherent real optionality and for robustness check,we compare the semi-analytical pricing accuracy with the Monte Carlo simulation.Model parameters are estimated from the historical monthly data,and stochastic volatility parameters are obtained by matching the Kurtosis of the low-ash diff data to the Kurtosis of the stochastic volatility process which is assumed to follow Cox–Ingersoll–Ross(“CIR”)model.

随机利率与非仿射跳扩散模型下的欧式期权定价

研究了具有随机利率和泊松跳的非仿射随机波动率模型下的欧式期权定价问题.首先,运用扰动法去逼近标的对数资产价格的特征函数,并得到近似的解析式;然后,运用快速Fourier变换等方法推导出欧式期权的定价公式;其次,运用数值计算比较随机利率、固定利率以及非仿射波动率过程分别对欧式看涨期权价格的不同作用,以及分析模型中利率的波动率参数和仿射结构参数对期权价格的影响.结果表明,二者对期权价格结果的影响均是正向的,且非仿射随机波动率模型比仿射随机波动率模型具有更高的灵活性.

An efficient algorithm for Bermudan barrier option pricing

An efficient option pricing method based on Fourier-cosine expansions was presented by Fang and Oosterlee for European options in 2008, and later, this method was also used by them to price early-exercise options and barrier options respectively, in 2009. In this paper, this method is applied to price discretely American barrier options in which the monitored dates are many times more than the exercise dates. The corresponding algorithm is presented to practical option pricing. Numerical experiments show that this algorithm works very well and efficiently for different exponential Levy asset models.

An Accurate FFT-Based Algorithm for Bermudan Barrier Option Pricing

An efficient and accurate numerical method, which is called the CONV method, was proposed by Lord et al in [1] to price Bermudan options. In this paper, this method is applied to price Bermudan barrier options in which the monitored dates may be many times more than the exercise dates. The corresponding algorithm is presented to practical option pricing. Numerical experiments show that this algorithm works very well for different exponential Lévy asset models.

基于Landau’s变换的求解美式期权的有限差分法

针对标准美式看跌期权定价问题给出一种基于Landau’s变换的有限差分法.先利用Landau’s变换及截断技巧将美式期权问题转化为一个有界规则区域上的抛物问题,再利用有限差分法求解期权价格,并利用Newton迭代法同时求解出最佳实施边界.数值实验结果表明,该算法能快速有效地求解出较传统二叉树法更光滑的最佳实施边界,并能准确地模拟美式看跌期权价格.

美式看跌期权定价的一种混合数值方法

本文对美式看跌期权的定价提供了一种新的混合数值方法,即快速傅里叶变换法加龙格-库塔法.首先将美式看跌期权价格所满足的Black-Scholes微分方程定解问题转化为一个标准的抛物型初、边值问题,然后通过傅里叶变换,使之转换为一个不带股价变量的常微分方程初值问题,再利用龙格-库塔法对其进行数值求解.数值实验表明,本文算法是一种快速的高精度的算法.

美式看跌期权的最佳执行价格

利用快速傅里叶变换法加龙格-库塔法对期权的最佳执行价格进行了分析和计算,最后通过数值算例说明了这一方法的有效性和准确性.

随机市场下美式看涨期权的定价

讨论在无风险资产有依赖时间的随机银行利率、随机期望收益率、分红率以及随机的波动率下美式看涨期权的定价问题.利用Fourier变换方法求得美式看涨期权的一个封闭解,并给出了有交易费用的美式期权定价公式.

Pareto-Beta跳扩散期权定价模型的校正

为校正Pareto-Beta跳扩散期权定价模型,首先,利用Pareto-Beta跳扩散模型和双指数跳扩散模型之间的联系使模型参数减少,然后,通过使欧式期权价格和相应的市场价格之间的均方误差最小将模型校正问题转化为局部最优化问题,通过在均方误差项增加一个惩罚函数保证了解的存在性和唯一性.为了提高模型校正的效率,利用快速傅立叶变换方法计算欧式期权价格.最后,将模型和校正算法应用于S&P 500指数期权进行实证分析,数值结果显示,所提校正算法具有较好的稳定性.

基于非仿射随机波动率模型的期权定价研究

本文应用快速傅里叶变换(FFT)方法,考虑了标的资产服从非仿射随机波动率模型下的期权定价问题。首先,应用偏微分方程扰动分析法,得到了标的资产对数价格分布的近似特征函数;然后,应用傅里叶变换及其逆变换,推导了欧式期权的拟闭型定价公式,对此公式应用FFT方法可以快速得到高精度数值解。数值实验表明,FFT期权定价方法是非常精确的和有效的;最后,给出了基于恒生指数认购权证的实证研究。实证结果表明,非仿射随机波动率期权定价模型比经典的Black-Scholes模型具有更高的定价精确性。

随机波动率跳跃扩散模型下复合期权定价

复合期权是一类以期权作为标的物的奇异型合约,它已广泛应用于许多金融实践。本文在股价满足一类随机波动率及跳跃均存在于股价和波动率的仿射跳跃扩散模型下(也称随机波动率混合跳跃扩散模型)考察了复合期权的定价。应用二维特征函数和Fourier反变换方法获到了标的为欧式标准看涨期权的欧式复合看涨期权的定价半封闭公式,并将其应用于推导扩展期权的定价。最后,借助于离散快速Fourier变换法(FFT)数值计算定价公式,并用数值实例分析了期权价格对波动率的敏感性。数值结果表明扩散波动和跳跃波动对期权价格都有正的影响,而且跳跃波动的冲击非常显著。

Bates模型下一种美式期权高阶紧致有限差分定价方法

基于Jain提出的高阶紧致有限差分格式(high order compact of Jain,HOCJ),结合卷积积分(convolution integral)与快速傅里叶变换(FFT),构建了一种新颖的数值方法,简称HOCJ-CF,并用于Bates模型下美式看跌期权定价.针对期权定价偏积分微分方程(PIDE)的微分项,首先将其拆分成三个子偏微分方程(sub-PDE),然后分别应用Numerov离散方法,衍生出具有空间四阶精度和时间二阶精度的HOCJ格式;积分项则将其转化成卷积积分,并运用FFT.在相同模型参数设置下,数值结果验证了新方法在精度、收敛率及效率相比IMEX格式的优越性.

指数Lévy跳-扩散模型下欧式期权的COS定价方法

主要研究指数Lévy形式的跳-扩散模型下欧式期权的定价问题.首先,给出了模型在均值修正等价鞅测度下的风险中性特征函数;然后,基于特征函数给出了欧式期权的傅里叶COS定价方法,并对COS方法进行修正,得到了指数Lévy形式跳-扩散模型的期权定价公式;最后,通过数值实验和实证分析检验了COS定价方法有效性,结果表明COS方法是一种稳定有效的数值方法,修正后的COS定价方法收敛速度更快、精度更高,与BS模型相比,跳-扩散模型能更精确的拟合市场数据.