Through a series of state ""Freedom of Information Act"" requests, the ACLU has begun to learn more about the secretive program known as the Multi-State Anti-Terrorism Information Exchange (MATRIX).

This article demonstrates a fast and practical procedure for the maximum likelihood estimation of models with spatial interaction on a lattice, such as Gaussian Markov random fields (conditional ...

The information matrix can equivalently be determined via the expectation of the Hessian matrix or the expectation of the outer product of the score vector. The identity of these two matrices, however ...