Figure 1From: Syndromic surveillance: STL for modeling, visualizing, and monitoring disease counts STL decomposition for respiratory square root daily counts. Respiratory square root daily counts and four components of variation of the STL decomposition for an Indiana emergency department (ED). The four components sum to the square root counts. The solid vertical lines show January 1 and the dashed vertical lines show April 1, July 1, and October 1.Back to article page