Hi. I am just getting started with R. I would like to start by using one of the autoregressive models (beginning at the very basic, perhaps with just ar) to forecast a multivariate time series one step ahead without noise and, while digging around for how to do so, maybe someone can just tell me whether there is an option to set the noise term to 0 (zero). How do I set the noise term to zero? Thank you. -- Michael Shaw Cooperative Institute for Research in Environmental Sciences Campus Box 216 University of Colorado, Boulder, 80309-0216 303-492-3619 michaejs at cires.colorado.edu --