Mulitregional CUSUM Surveillance

Monitoring sales of over-the-counter products is becoming increasingly common for purposes of public health surveillance. Sales data for anti-diarrheal medications have been used to monitor outbreaks of waterborne Cryptosporidium outbreaks. An attractive feature of is its focus upon coupling predictions of sales for a given day (based upon times series methods) with control chart methods from the field of statistical process control.

Objective

This paper suggests and illustrates several approaches to surveillance when data are available for several regions.