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关注这篇论文的作者
Yifan Li
Reg Kulperger
Hao Yu

半 G 正态:经典正态与 G 正态之间的混合结构(完整版本)

研究问题
如何通过兼具方差不确定性与零偏度的分布结构,解释 G 正态的分布不确定性及序贯独立性与偏度的关系?
方法与思路
作者引入半 G 正态结构,研究不同独立性定义下具有该边际分布的随机向量表示,并联系状态空间波动模型。
材料陈述的贡献
摘要称施加 G 意义下的序贯独立性会产生非零偏度,并提供多类随机向量表示,作为理解经典正态与 G 正态的桥梁。
阅读关注点
应核对半 G 正态的定义、不同独立性概念及其顺序,以及随机向量表示与状态空间波动模型的对应条件。
阅读边界
这是 arXiv 预印本的完整版本,同行评审及期刊接收未经核实;摘要未给出证明或实证,不能推断金融建模效果。

原文摘要

The $G$-expectation framework is a generalization of the classical probabilistic system motivated by Knightian uncertainty, where the $G$-normal plays a central role. However, from a statistical perspective, $G$-normal distributions look quite different from the classical normal ones. For instance, its uncertainty is characterized by a set of distributions which covers not only classical normal with different variances, but additional distributions typically having non-zero skewness. The $G$-moments of $G$-normals are defined by a class of fully nonlinear PDEs called $G$-heat equations. To understand $G$-normal in a probabilistic and stochastic way that is more friendly to statisticians and practitioners, we introduce a substructure called semi-$G$-normal, which behaves like a hybrid between normal and $G$-normal: it has variance uncertainty but zero-skewness. We will show that the non-zero skewness arises when we impose the $G$-version sequential independence on the semi-$G$-normal. More importantly, we provide a series of representations of random vectors with semi-$G$-normal marginals under various types of independence. Each of these representations under a typical order of independence is closely related to a class of state-space volatility models with a common graphical structure. In short, semi-$G$-normal gives a (conceptual) transition from classical normal to $G$-normal, allowing us a better understanding of the distributional uncertainty of $G$-normal and the sequential independence.

笔记与分组