Figure 2
From: An empirical comparison of spatial scan statistics for outbreak detection
Detectability results for four public health datasets. Number of injected cases needed for detection of 90% of outbreaks at 1 false positive per month, as a function of outbreak size. The x-axis of each graph represents the number of Allegheny County zip codes affected by the outbreak, out of 88 monitored zip codes for the ED dataset and 58 monitored zip codes for the three OTC datasets.