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arXiv 0909.0851math.STstat.TH
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关于半正定Ornstein-Uhlenbeck型过程的定义、平稳分布和二阶结构

On the definition, stationary distribution and second order structure of positive semidefinite Ornstein--Uhlenbeck type processes

Christian Pigorsch, Robert Stelzer

摘要:

分析了Ornstein-Uhlenbeck型半正定过程的几个重要性质.它表明,线性算子的形式$X\mapsto AX+XA^{\mathrm{T}}$与$A\in M_d(\mathbb{R})$是唯一的,可以使用的定义提供一个要求自然的非退化条件。此外,我们还分析了平稳分布的绝对连续性(特别是当驱动矩阵从属子是$d$维Lévy过程的二次变分时),并研究了如何选择驱动矩阵从属子以得到给定的平稳分布的问题.最后,我们给出了矩阵从属子的一阶和二阶矩结构的结果,它与半正定Ornstein-Uhlenbeck型过程的矩结构密切相关。后者的结果是重要的矩估计方法。

英文摘要:

Several important properties of positive semidefinite processes of Ornstein--Uhlenbeck type are analysed. It is shown that linear operators of the form $X\mapsto AX+XA^{\mathrm{T}}$ with $A\in M_d(\mathbb{R})$ are the only ones that can be used in the definition provided one demands a natural non-degeneracy condition. Furthermore, we analyse the absolute continuity properties of the stationary distribution (especially when the driving matrix subordinator is the quadratic variation of a $d$-dimensional Lévy process) and study the question of how to choose the driving matrix subordinator in order to obtain a given stationary distribution. Finally, we present results on the first and second order moment structure of matrix subordinators, which is closely related to the moment structure of positive semidefinite Ornstein--Uhlenbeck type processes. The latter results are important for method of moments based estimation.

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