arXiv subjects

Panagiotis Stinis

Publications and source records attributed to Panagiotis Stinis.

20 records · Page 2Linked to original sources

arXiv2004

A maximum likelihood algorithm for the estimation and renormalization of exponential densities

We present an algorithm based on maximum likelihood for the estimation and renormalization (marginalization) of exponential densities. The moment-matching problem resulting from the maximization of the likelihood is solved as an optimization problem using the Levenberg-Marquardt algorithm. In the case of renormalization, the moments needed to set up the moment-matching problem are evaluated using Swendsen's renormalization method. We focus on the renormalization version of the algorithm, where we demonstrate its use by computing the critical temperature of the two-dimensional Ising model. Possible applications of the algorithm are discussed.

math.ST↗

arXiv2003

Stochastic Optimal Prediction for the Kuramoto-Sivashinsky Equation

We examine the problem of predicting the evolution of solutions of the Kuramoto-Sivashinsky equation when initial data are missing. We use the optimal prediction method to construct equations for the reduced system. The resulting equations for the resolved components of the solution are random integrodifferential equations. The accuracy of the predictions depends on the type of projection used in the integral term of the optimal prediction equations and on the choice of resolved components. The novel features of our work include the first application of the optimal prediction formalism to a nonlinear, non-Hamiltonian equation and the use of a non-invariant measure constructed through inference from empirical data.

math.NA↗