Variance–covariance from a metropolis chain on a curved, singular manifold
弯曲奇异流形上 Metropolis 链的方差与协方差AI 解读 ↓
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弯曲奇异流形上 Metropolis 链的方差与协方差AI 解读 ↓
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We consider estimation of variance and covariance from a point cloud that are draws from a posterior distribution that lie on a curved, singular manifold. The motivating application is Bayesian inference regarding a likelihood subject to overidentified moment equations using MCMC (Markov Chain Monte Carlo). The MCMC draws lie on a singular manifold that typically is curved. Variance and covariance are Euclidean concepts. A curved, singular manifold is not typically a Euclidean space. We explore some suggestions on how to adapt a Euclidean concept to a non-Euclidean space then build on them to propose and illustrate appropriate methods.