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arXiv 2103.15310q-fin.MFmath.PRstat.ME
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调和稳定过程极值的蒙特卡洛算法

Monte Carlo algorithm for the extrema of tempered stable processes

Jorge Ignacio González Cázares, Aleksandar Mijatović

AI总结:

本文提出一种基于未调和过程增量的蒙特卡洛算法,用于高效计算调和稳定过程的极值向量,并证明其最优复杂度,为障碍期权定价和风险度量提供置信区间。

摘要:

我们针对指数调和Lévy过程的向量(包括上确界、达到上确界的时间以及给定常数时间点的位置)开发了一种新颖的蒙特卡洛算法。该算法基于未调和过程的增量,对于向量的不连续和局部Lipschitz函数,其收敛速度呈几何级数(作为计算成本的函数)。我们证明了相应的多级蒙特卡洛估计器具有最优计算复杂度(即若均方误差不超过ε²,则复杂度为ε⁻²量级),并提供了其中心极限定理(CLT)。利用该CLT,我们为基于实际数据校准/估计的调和稳定(CGMY)模型下的障碍期权价格和基于回撤的各种风险度量构建了置信区间。我们提供了我们的算法与现有近似的非渐近和渐近比较,为用户在给定参数集下选择最佳方法提供了经验法则指南。我们通过数值示例展示了算法的性能。

英文摘要:

We develop a novel Monte Carlo algorithm for the vector consisting of the supremum, the time at which the supremum is attained and the position at a given (constant) time of an exponentially tempered Lévy process. The algorithm, based on the increments of the process without tempering, converges geometrically fast (as a function of the computational cost) for discontinuous and locally Lipschitz functions of the vector. We prove that the corresponding multilevel Monte Carlo estimator has optimal computational complexity (i.e. of order $\varepsilon^{-2}$ if the mean squared error is at most $\varepsilon^2$) and provide its central limit theorem (CLT). Using the CLT we construct confidence intervals for barrier option prices and various risk measures based on drawdown under the tempered stable (CGMY) model calibrated/estimated on real-world data. We provide non-asymptotic and asymptotic comparisons of our algorithm with existing approximations, leading to rule-of-thumb guidelines for users to the best method for a given set of parameters. We illustrate the performance of the algorithm with numerical examples.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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