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High dimensional dynamic stochastic copula models
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DOI：10.1016/j.jeconom.2015.03.027.png)
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We build a class of copula models that captures time-varying dependence across large panels of financial assets. Our models nest Gaussian, Student's t, grouped Student's t, and generalized hyperbolic copulas with time-varying correlations matrices, as special cases. We introduce time-variation into the densities by writing them as factor models with stochastic loadings. The proposed copula models have flexible dynamics and heavy tails yet remain tractable in high dimensions due to their factor structure. Our Bayesian estimation approach leverages a recent advance in sequential Monte Carlo methods known as particle Gibbs sampling which can draw large blocks of latent variables efficiently and in parallel. We use this framework to model an unbalanced, 200-dimensional panel consisting of credit default swaps and equities for 100 US corporations. Our analysis shows that the grouped Student's t stochastic copula is preferred over seven competing models. (C) 2015 Elsevier B.V. All rights reserved.
Keyword:
State space models
Dynamic copulas
Bayesian estimation
Particle filters
Credit default swaps
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