Volume 15, Number 4—April 2009
Research
Enhancing Time-Series Detection Algorithms for Automated Biosurveillance
Jerome I. Tokars
, Howard Burkom, Jian Xing, Roseanne English, Steven Bloom, Kenneth Cox, and Julie A. Pavlin
, Howard Burkom, Jian Xing, Roseanne English, Steven Bloom, Kenneth Cox, and Julie A. PavlinTable 2
Mean absolute residual, by method and dataset, for selected BioSense data used in algorithm modification study*
| Stratification of baseline by weekday vs. weekend | Mean absolute residual |
||||
|---|---|---|---|---|---|
| Department of Defense |
Hospital emergency department |
||||
| Count | Rate | Count | Rate | ||
| Unstratified | 4.2 | 2.4 | 2.2 | 2.0 | |
| Stratified | 2.4 | 2.2 | 2.3 | 2.0 | |
*The count method uses only numerator data; the rate method uses numerator and denominator data. Because varying the baseline duration did not affect residuals (data not shown), all calculations shown here use a baseline duration of 7 days.
