Dear R-Help, I'm trying to learn the sspir package for state space modeling. Has anyone coded a cubic spline smoother (continuous time) in state space format in sspir? The syntax for setting up the various matrices would be really helpful. Best Simon -- Simon D.W. Frost, D.Phil. Assistant Adjunct Professor of Pathology University of California, San Diego Mailcode 8208 UCSD Antiviral Research Center 150 W. Washington St. San Diego, CA 92103 Tel: +1 619 543 8898 Fax: +1 619 543 5094 Email: sdfrost at ucsd.edu