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.
Plots of the data sets we apply our methods to. In each case, the last four years of data are held out as a test data set; this cutoff is indicated with a vertical dashed line. For the flu data set, low-season incidence was not recorded in early years of data collection. These missing data are indicated with vertical grey bars.
