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• W2084563301 abstract "The correlation matrix (denoted by R) plays an important role in many statistical models. Unfortunately, sampling the correlation matrix in Markov chain Monte Carlo (MCMC) algorithms can be problematic. In addition to the positive definite constraint of covariance matrices, correlation matrices have diagonal elements fixed at one. In this article, we propose an efficient two-stage parameter expanded reparameterization and Metropolis-Hastings (PX-RPMH) algorithm for simulating R. Using this algorithm, we draw all elements of R simultaneously by first drawing a covariance matrix from an inverse Wishart distribution, and then translating it back to a correlation matrix through a reduction function and accepting it based on a Metropolis-Hastings acceptance probability. This algorithm is illustrated using multivariate probit (MVP) models and multivariate regression (MVR) models with a common correlation matrix across groups. Via both a simulation study and a real data example, the performance of the PX-RPMH algorithm is compared with those of other common algorithms. The results show that the PX-RPMH algorithm is more efficient than other methods for sampling a correlation matrix." @default.
• W2084563301 created "2016-06-24" @default.
• W2084563301 creator A5031529176 @default.
• W2084563301 creator A5051862250 @default.
• W2084563301 date "2006-12-01" @default.
• W2084563301 modified "2023-09-25" @default.
• W2084563301 title "A New Algorithm for Simulating a Correlation Matrix Based on Parameter Expansion and Reparameterization" @default.
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• W2084563301 doi "https://doi.org/10.1198/106186006x160681" @default.
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