Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
A schematic representation of a linear dynamic system. In this diagram, filled ovals represent observed continuous-valued variables while unfilled ovals represent continuous-valued variables that must be estimated from the data. Arrows indicate directional dependency.
