Bayesian Modular Inference for Copula Models with Potentially Misspecified Marginals
边际可能误设的 Copula 模型的贝叶斯模块化推断AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要明确提到用偏正态 Copula 建模股票波动率与债券收益率的非对称依赖,并强调对边际误设稳健化 Copula 估计,直接对应波动率与尾部/依赖风险方向。
边际可能误设的 Copula 模型的贝叶斯模块化推断AI 解读 ↓
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Copula models of multivariate data are popular because they allow separate specification of marginal distributions and the copula function. These components can be treated as inter-related modules in a modified Bayesian inference approach called ''cutting feedback'' that is robust to their misspecification. Recent work uses a two module approach, where all $d$ marginals form a single module, to robustify inference for the marginals against copula function misspecification, or vice versa. However, marginals can exhibit differing levels of misspecification, making it attractive to assign each its own module with an individual influence parameter controlling its contribution to a joint semi-modular inference (SMI) posterior. This generalizes existing two module SMI methods, which interpolate between cut and conventional posteriors using a single influence parameter. We develop a novel copula SMI method and select the influence parameters using Bayesian optimization. It provides an efficient continuous relaxation of the discrete optimization problem over $2^d$ cut/uncut configurations. We establish theoretical properties of the resulting semi-modular posterior and demonstrate the approach on simulated and real data. The real data application uses a skew-normal copula model of asymmetric dependence between equity volatility and bond yields, where robustifying copula estimation against marginal misspecification is strongly motivated.