Hello, I am wondering whether 'R' has a command to produce coefficient estimates for AR/MA model when variance-covariance matrix is given as an input. Thank you very much for your help, MoonJung ***************** Moon Jung Cho Office of Survey Methods Research U.S. Bureau of Labor Statistics 2 Massachusetts Ave. N.E. Washington, D.C. 20212 W) 202-691-7384 Fax) 202-691-7426 [[alternative HTML version deleted]]