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.
Flat circles means strong correlation and regular circles weak correlation. Positive correlation are depicted by blue ellipses bending to the right, while negative correlation is given by red ellipses bending to the left.
