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.
These combinations correspond to the highest mean Aci values over all possible cluster numbers. The maximum occurs for the cluster numbers between 50 and 80.
