Displaying results 1 - 3 of 3
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Implementation and Comparison of Preprocessing Methods for Biosurveillance Data
Content Type: Abstract
Modern biosurveillance relies on multiple sources of both prediagnostic and diagnostic data, updated daily, to discover disease outbreaks. Intrinsic to this effort are two assumptions: (1) the data being analyzed contain early indicators… read more… Cummulative Sum; DHS, Department of Homeland Security; DOE, Department of Energy; DOW, day-of-week; EARS, Early … are defined such that if the process remains in control, all (or nearly all) of the sample means will fall within the … independent and identically distributed (iid), with the dis- tribution generally assumed normal (although … -
Preparing Biosurveillance Data for Classic Monitoring
Content Type: Abstract
Modern surveillance systems use statistical process control (SPC) charts such as Cumulative Sum and Exponentially Weighted Moving Average charts for monitoring daily counts of such quantities as ICD-9 codes from ED visits,… read more… of a CuSum chart to raw counts of cough medication sales (top) vs. to the preconditioned series using the different … results and additional evaluations were performed for all other series. The day-of-week effect is a major cause of … and, in some series, so is seasonality. Figure 1: Raw (top) and five preconditioned versions of daily cough … -
Automated Time Series Forecasting for Biosurveillance
Content Type: Abstract
The statistical process control (SPC) community has developed a wealth of robust, sensitive monitoring methods in the form of control charts [1]. Although such charts have been implemented for a wide variety of health monitoring purposes [2], some… read more… The mean-based criterion was less conclusive due to the effects of poor forecasts on a small number of …