14,295 research outputs found
Monte Carlo Estimation of the Density of the Sum of Dependent Random Variables
We study an unbiased estimator for the density of a sum of random variables
that are simulated from a computer model. A numerical study on examples with
copula dependence is conducted where the proposed estimator performs favourably
in terms of variance compared to other unbiased estimators. We provide
applications and extensions to the estimation of marginal densities in Bayesian
statistics and to the estimation of the density of sums of random variables
under Gaussian copula dependence
Information-theoretic measurements of coupling between structure and dynamics in glass-formers
We analyse the connections between structure and dynamics in two model
glass-formers, using the mutual information between an initial configuration
and the ensuing dynamics to compare the predictive value of different
structural observables. We consider the predictive power of normal modes,
locally favoured structures, and coarse-grained measurements of local energy
and density. The mutual information allows the influence of the liquid
structure on the dynamics to be analysed quantitatively as a function of time,
showing that normal modes give the most useful predictions on short time scales
while local energy and density are most strongly predictive at long times.Comment: 10 pages, 7 fig
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