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.
The run chart is a plot of a measurement over time. The horizontal line is the median, which divides the data points in two halves. The main purpose of the run chart is to identify non-random variation. For this purpose, several runs tests are available.
