Abstract Details
Activity Number:
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4
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Type:
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Invited
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Date/Time:
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Sunday, August 9, 2015 : 2:00 PM to 3:50 PM
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Sponsor:
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Section on Bayesian Statistical Science
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Abstract #314306
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View Presentation
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Title:
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A Tractable State-Space Model for Symmetric Positive-Definite Matrices
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Author(s):
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Jesse Windle* and Carlos M. Carvalho
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Companies:
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Duke University and The University of Texas at Austin
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Keywords:
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backward sample ;
forward filter ;
realized covariance ;
stochastic volatility
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Abstract:
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The Bayesian analysis of a state-space model includes computing the posterior distribution of the system's parameters as well as its latent states. When the latent states wander around Euclidean space there are several well-known modeling components and computational tools that may be profitably combined to achieve this task. When the latent states are constrained to a strict subset of Euclidean space these models and tools are either impaired or break down completely. State-space models whose latent states are covariance matrices arise in finance and exemplify the challenge of devising tractable models in the constrained setting. To that end, we present a state-space model whose observations and latent states take values on the manifold of symmetric positive-definite matrices and for which one may easily compute the posterior distribution of the latent states and the system's parameters as well as filtered distributions and one-step ahead predictions. Employing the model within the context of finance, we show how one can use realized covariance matrices as data to predict latent time-varying covariance matrices. This approach out-performs factor stochastic volatility.
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Authors who are presenting talks have a * after their name.
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