Arthur G. Fitzmaurice
, Laurie Linley, Chenhua Zhang, Meg Watson, Anne Marie France, and Alexandra M. Oster
Figure 1. Alert criteria used in method for identifying spatiotemporal clusters of HIV diagnoses. For each cluster, the total number of cases (X) in a specified geographic area during the most recent 12 months exceeds the baseline mean (μ) of the previous 3 12-month periods by >2 SD (σ) and >2 diagnoses.