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.
Associations between domains using Kendall Tau-b correlation coefficients. Tau-b ranges between +1.0 and −1.0, with 0 indicating the absence of association. Coefficients of > (+) 0.6 or < (−) 0.6 correlate with strong agreement or inversion, respectively.
