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arXiv 1107.0233math.PR
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具有上下上限的极大过程的最优停止问题

Optimal stopping problems for the maximum process with upper and lower caps

Curdin Ott

摘要:

研究了由谱负Lévy过程$X$的运行极大值驱动的最优停止问题.更确切地说,我们感兴趣的修改Shepp-Shiryaev最优停止问题[阿夫拉姆,Kyprianou和皮斯托瑞斯安。14(2004)215-238; Shepp和Shiryaev Ann. Appl. Probab. 3(1993)631-640; Shepp和Shiryaev Theory Probab. 39(1993)103-119]。首先,我们考虑一个上限版本的Shepp-Shiryaev最优停止问题,并提供解决方案明确的尺度函数。特别是,最佳停止边界的特点是由一个常微分方程,涉及尺度函数和变化,根据路径变化的$X$。其次,在[Shepp,Shiryaev和Sulem Advances in Finance and Stochastics(2002)271-284 Springer]的精神下,我们考虑了Shepp-Shiryaev最优停止问题的上限版本的修改,在这个意义上,停止的决定必须在过程$X$下降到给定水平以下之前做出。

英文摘要:

This paper concerns optimal stopping problems driven by the running maximum of a spectrally negative Lévy process $X$. More precisely, we are interested in modifications of the Shepp-Shiryaev optimal stopping problem [Avram, Kyprianou and Pistorius Ann. Appl. Probab. 14 (2004) 215-238; Shepp and Shiryaev Ann. Appl. Probab. 3 (1993) 631-640; Shepp and Shiryaev Theory Probab. Appl. 39 (1993) 103-119]. First, we consider a capped version of the Shepp-Shiryaev optimal stopping problem and provide the solution explicitly in terms of scale functions. In particular, the optimal stopping boundary is characterised by an ordinary differential equation involving scale functions and changes according to the path variation of $X$. Secondly, in the spirit of [Shepp, Shiryaev and Sulem Advances in Finance and Stochastics (2002) 271-284 Springer], we consider a modification of the capped version of the Shepp-Shiryaev optimal stopping problem in the sense that the decision to stop has to be made before the process $X$ falls below a given level.

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