arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1401.6909math.PR
收藏

密度函数鞅的动态构造

Dynamic construction of martingales of density functions

Shiqi Song

摘要:

随机时间的密度假设现在成为风险建模的标准。引入密度假设的基本原因之一是希望有一个可计算的信用风险模型。然而,最近的工作表明,仅仅存在一个密度函数的随机时间的条件律将是不够的,一些数值植入问题的目的。随着信息流的发展,有必要建立具有密度函数鞅的模型,特别是具有由随机微分方程确定的密度函数的马尔可夫鞅。在一维情形下,回答了由随机微分方程构造密度函数鞅的问题.本说明的目的是提供一个解决方案,在高维情况下。

英文摘要:

The density hypothesis on random times becomes now a standard in modeling of risks. One of the basic reasons to introduce the density hypothesis is the desire to have a computable credit risk model. However, recent work shows that merely an existence of a density function for the conditional law of the random times will not be enough for the purposes of some numerical implantation problems. It becomes necessary to have models with martingales of density functions evolving along with the development of the information flow, in particular, to have Markovian martingales of density functions determined by a stochastic differential equation. The quetion of constructing a martingale of density functions by a stochastic differential equation has been answered in one dimensional case. The aim of this note is to provide a solution in higher dimensional cases.

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。

↑