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.
(Left) The true network is sampled by randomly selecting nodes (red). (Right) The node induced subnetwork consists of sampled nodes and edges whose endpoints both lie in the collection of sampled nodes.
