Paper: arXiv 2601.13281

Authors: Koos B. Gubbels, Andre Lucas

Abstract

We introduce a novel model for time-varying, asymmetric, tail-dependent copulas in high dimensions that incorporates both spectral dynamics and regularization. The dynamics of the dependence matrix’ eigenvalues are modeled in a score-driven way, while biases in the unconditional eigenvalue spectrum are resolved by non-linear shrinkage. The dynamic parameterization of the copula dependence matrix ensures that it satisfies the appropriate restrictions at all times and for any dimension. The model is parsimonious, computationally efficient, easily scalable to high dimensions, and performs well for both simulated and empirical data. In an empirical application to financial market dynamics using 100 stocks from 10 different countries and 10 different industry sectors, we find that our copula model captures both geographic and industry related co-movements and outperforms recent computationally more intensive clustering-based factor copula alternatives. Both the spectral dynamics and the regularization contribute to the new model’s performance. During periods of market stress, we find that the spectral dynamics reveal strong increases in international stock market dependence, which causes reductions in diversification potential and increases in systemic risk.

Complexity vs Empirical Score

  • Math Complexity: 7.5/10
  • Empirical Rigor: 8.0/10
  • Quadrant: Holy Grail — high math complexity, high empirical rigor

Why this score: The paper provides a strong combination of high-dimensional matrix score dynamics and non-linear shrinkage theory within a flexible generalized hyperbolic skewed t-copula framework. The methodology is rigorously evaluated against existing factor copula models using both simulations and an extensive 100-asset empirical study across multiple countries and sectors.

Research Flowchart

  flowchart TD
    A[Research Goal: Model high-dimensional time-varying copulas efficiently] --> B[Input Data: 100 global stocks across 10 countries & 10 sectors]
    B --> C[Methodology: Combine Score-Driven Spectral Dynamics & Non-Linear Shrinkage]
    C --> D[Computation: Dynamic eigenvalue parameterization & bias regularization]
    D --> E[Outcomes: Outperforms factor copulas & reveals systemic risk/co-movements during market stress]

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1 of 63 cited works are in the corpus; resolved via arXiv source bundles, Semantic Scholar and OpenAlex. Corpus-wide: 2518 linked papers.