Hi, Is anyone able to give me references or explain how the "decision boundary" is calculated by the LDA function in MASS. e.g. p 335-336 of MASS 4th Ed. Since it's curved I'm assuming they're doing something like fitting 2-D Gaussians to the groups and plotting the contour line describing the intersection. I'd like to understand the general ideas behind this as I need a short description for a paper I'm writing. It's biosciences so I'm after concepts rather than many equations. Thanks! Rob