Hi, Does anyone know that finding the exact algorithm of minimum covariance determinant (ie, min det(cov(Y)) subject to Y is a subset of a sample X and |Y| = h for some fixed h) is NP-Hard (or NP-complete)? Thanks in advance. -- Salem ================================================================= Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =================================================================